Mi hermana dejó las monedas en la guantera y el móvil en el bolso.

Dejó is the preterite form of dejar, meaning left in the sense of put down / left somewhere.

• deja = she leaves / is leaving / does leave (present)
• dejó = she left (completed past action)

The accent mark matters:

• dejo (without the accent) would mean I leave
• dejó means he/she/it left

So Mi hermana dejó... = My sister left...

Here dejar means to leave something somewhere or to put something down and leave it there.

In this sentence, it does not mean to allow.

Common meanings of dejar include:

• leave something somewhere → the meaning here
• let / allow → for example, Mi madre me deja salir
• stop / give up → for example, dejar de fumar

So in this sentence, dejó las monedas en la guantera means she left the coins in the glove compartment.

Spanish uses the definite article very often, more often than English does.

Here:

• las monedas = the coins
• la guantera = the glove compartment
• el móvil = the mobile phone
• el bolso = the handbag / purse

Even when English might prefer her phone or her bag, Spanish often uses the article if the context already makes the owner clear.

So:

• Mi hermana dejó el móvil en el bolso sounds natural.
• Mi hermana dejó su móvil en su bolso is also possible, but it can sound more explicit than necessary.

Both exist, but in Spain, el móvil is the normal everyday word for mobile phone.

Regional difference:

• Spain: el móvil
• Many Latin American countries: el celular

Since you are learning Spanish from Spain, el móvil is exactly what you would expect here.

La guantera means the glove compartment in a car.

It comes from guante meaning glove, because historically that compartment was associated with storing gloves.

It is a feminine noun:

• la guantera
• en la guantera = in the glove compartment

Because Spanish, like English, often omits repeated words when they are understood from the first part of the sentence.

So:

• Mi hermana dejó las monedas en la guantera y el móvil en el bolso

really means:

• Mi hermana dejó las monedas en la guantera y dejó el móvil en el bolso

The second dejó is omitted to avoid repetition. This is very natural.

Because en is the normal preposition for in / inside / on in many location contexts.

With dejar, if you say where something was left, you usually use en:

• dejar algo en la mesa = leave something on the table
• dejar algo en el coche = leave something in the car
• dejar algo en el bolso = leave something in the bag

So:

• en la guantera = in the glove compartment
• en el bolso = in the handbag

Nouns in Spanish have grammatical gender, which does not always match any logical real-world rule.

Here:

• el móvil → masculine
• la guantera → feminine
• el bolso → masculine
• las monedas → feminine plural because la moneda is feminine

You usually have to learn each noun together with its article:

• el móvil
• la guantera
• el bolso
• la moneda

That helps you remember the gender naturally.

Yes, it could:

• Mi hermana dejó las monedas en la guantera y su móvil en su bolso.

This is grammatically correct. However, Spanish often prefers the article when possession is already obvious from context.

Using su may sound:

• more explicit
• more contrastive
• sometimes slightly heavier than necessary

So the original sentence sounds very natural.

This is a very common question.

• el bolso usually means handbag, purse, or bag
• la bolsa often means bag, especially a shopping bag, plastic bag, or carrier bag

In this sentence, el bolso suggests a personal bag or handbag, which fits well with el móvil being inside it.

Yes, Spanish allows some flexibility, although the original order is very natural.

Original:

• Mi hermana dejó las monedas en la guantera y el móvil en el bolso.

You could also say:

• Mi hermana dejó en la guantera las monedas y en el bolso el móvil.

That version is grammatical, but it sounds more marked or stylistic. The original is more neutral and natural for everyday speech.

A close translation is:

• My sister left the coins in the glove compartment and the phone in the handbag.

But in natural English, people might also say:

• My sister left the coins in the glove compartment and her phone in her bag.

Spanish often leaves possession more implicit than English does, so a very literal translation may sound slightly less natural in English than in Spanish.