Hon råkar ofta säga ja för snabbt, även när hon egentligen vill säga nej.

Råkar means to happen to / to accidentally do something (often implying it’s unplanned or unintended).
So Hon råkar ofta säga ja… = She often happens to say yes… (she ends up doing it, maybe without thinking).

Brukar means usually / tends to in the sense of a regular habit: Hon brukar säga ja… = She usually says yes… (more like a typical pattern, not necessarily accidental).

In a normal main-clause word order, Swedish typically places “small” adverbs like ofta after the finite verb (the verb that’s conjugated), which here is råkar:

• Hon råkar ofta säga…

Putting ofta before råkar is possible in some contexts (for emphasis or a different rhythm), but the most neutral/natural placement is after the finite verb.

It’s a common structure: råka + infinitive.

• råkar säga = happens to say / accidentally says
  The main action is in the infinitive (säga), while råkar adds the meaning of “happens to / by accident.”

In Swedish, ja and nej are often used like fixed response words after säga:

• säga ja = say yes
• säga nej = say no

You generally don’t treat them as countable nouns here, so ett ja would sound like “a yes” as a noun (possible in some contexts, but not in this sentence).

No. Here för means too (as in “excessively”):

• för snabbt = too fast / too quickly

It’s the same för as in:

• för dyrt = too expensive
• för sent = too late

Often they’re interchangeable:

• för snabbt / för fort = too quickly

fort is very common in everyday Swedish for “quickly.” snabbt can sound a bit more “neutral/standard,” but both are natural.

även när = even when (time/occasion). It introduces a situation where it still happens:

• även när hon egentligen vill säga nej = even when she actually wants to say no

även om = even if (hypothetical/conditional):

• även om hon egentligen vill säga nej would lean more toward even if she actually wants to say no (more hypothetical).
  In this sentence, även när fits best because it describes real occasions.

Because after a subordinating conjunction like när, Swedish uses subordinate-clause word order: the subject comes before the verb:

• …när hon vill…

In main clauses Swedish has V2 word order (the verb in second position), but subordinate clauses do not follow V2 in the same way.

egentligen means actually / really / in fact (often contrasting with what happens outwardly).

In subordinate clauses, adverbs like egentligen typically come before the finite verb:

• hon egentligen vill (adverb + verb)

You could move it for emphasis, but hon egentligen vill is the most neutral.

Swedish normally needs a verb after vill (want to). You “want to do” something:

• vill säga nej = wants to say no

You can’t normally say vill nej in standard Swedish.

They change the meaning:

• hinner säga ja = manages to / has time to say yes (time/ability)
• glömmer doesn’t fit directly here; you’d need a different structure, like Hon glömmer och säger ja… or Hon glömmer bort att säga nej…
• råkar säga ja specifically suggests it happens unintentionally or without meaning to.