Mia nipote tocca la radice con attenzione, ma non vuole salire sul tronco.

With singular close family members, Italian usually does not use the article before the possessive.

So:

• mia nipote = my niece / my granddaughter
• mio fratello = my brother
• mia madre = my mother

This is a very common rule with close family nouns in the singular.

Compare:

• mia sorella
• il mio amico

Family term: usually no article.
Non-family term: usually article + possessive.

One important note: there are some exceptions and variations, but for a learner, mia nipote is exactly what you should expect here.

Nipote can mean more than one family relationship:

• niece
• nephew
• granddaughter
• grandson

The word itself does not tell you which of these is meant. Context does.

In this sentence, mia shows the person is female, so it must be either:

• my niece, or
• my granddaughter

You would need context to know which one.

Not all feminine nouns in Italian end in -a, and not all masculine nouns end in -o.

Nipote is a noun that can be masculine or feminine, and the gender is shown by the words around it:

• mio nipote = my nephew / my grandson
• mia nipote = my niece / my granddaughter

So even though nipote ends in -e, it can still be feminine.

Italian uses definite articles much more often than English.

Here:

• la radice = the root
• il tronco = the trunk

Even if English might sometimes say touches a root or climb on the trunk depending on context, Italian often uses the definite article when talking about a specific thing in the scene or a thing understood from context.

So la radice and il tronco sound natural in Italian.

Tocca comes from the verb toccare, which means:

• to touch
• sometimes to tap
• in other contexts, even to concern or to be someone’s turn

Here it clearly means touches:

• Mia nipote tocca la radice = My niece/granddaughter touches the root

Because the subject is third person singular (mia nipote), the verb is tocca.

Yes, literally con attenzione means with attention, but in natural English it usually corresponds to:

• carefully
• with care
• attentively, depending on context

So:

• tocca la radice con attenzione = touches the root carefully

Italian often uses a prepositional phrase where English might prefer an adverb.

You could also say attentamente in some contexts, but con attenzione is very natural and common.

In Italian, the normal way to make a verb negative is to put non directly before the verb.

So:

• vuole = she wants
• non vuole = she doesn’t want

That is the standard pattern:

• parla → non parla
• mangio → non mangio
• andiamo → non andiamo

So ma non vuole simply means but she does not want.

Italian often omits subject pronouns, and it also often does not repeat the noun subject if it stays the same.

So after:

• Mia nipote tocca la radice con attenzione

Italian naturally continues with:

• ma non vuole salire sul tronco

The subject is still understood to be mia nipote.

In English, we usually repeat it:

• My niece touches the root carefully, but she doesn’t want to climb onto the trunk.

In Italian, repeating lei would usually be unnecessary unless you want emphasis or contrast.

Salire means to go up, to climb up, or to get onto, depending on context.

Here, salire sul tronco means something like:

• to climb onto the trunk
• to get up on the trunk

The form sul is a contraction of:

• su + il = sul

So:

• sul tronco = on the trunk / onto the trunk

This is very common in Italian:

• su + il = sul
• su + lo = sullo
• su + la = sulla
• su + i = sui
• su + gli = sugli
• su + le = sulle

Because the idea is up/on the trunk.

With salire, Italian often uses su when talking about moving upward onto a surface or object:

• salire sul tavolo = climb onto the table
• salire sul letto = get onto the bed
• salire sul tronco = climb onto the trunk

So su matches the idea of moving up onto something.

Not always.

Salire is broader than English climb. It can mean:

• to go up
• to get on
• to climb
• to ascend

For example:

• salire le scale = go up the stairs
• salire in macchina = get into the car
• salire sul tronco = climb onto the trunk

So in this sentence, climb is a good translation, but the core meaning is really go up onto.

Ma means but.

It connects the two ideas and shows contrast:

• Mia nipote tocca la radice con attenzione
  she touches the root carefully
• ma non vuole salire sul tronco
  but she does not want to climb onto the trunk

So the contrast is:

• she is willing to touch the tree,
• but she is not willing to climb on it.

Not always, but that is the meaning here.

Tronco can mean:

• tree trunk
• torso in some contexts
• trunk / main body of something figuratively

In this sentence, because we also have radice (root), the tree meaning is clearly intended:

• radice = root
• tronco = trunk

So the image is of someone near a tree, touching the root but not wanting to climb onto the trunk.