Она чуть было не упала.

As a set phrase, чуть было не means almost, came close to, or nearly.

So:

• Она чуть было не упала. = She almost fell.

A useful thing to remember is that Russian often expresses almost happened, but in fact did not happen with:

• чуть не + past verb
• чуть было не + past verb
• едва не + past verb

In this sentence, the fall did not actually happen.

Yes, by itself не упала means didn’t fall. But in the expression чуть было не, the не is part of the standard way Russian says almost did.

So this is not just a simple negated verb. Instead, the whole pattern means:

• came very close to falling, but did not fall

This can feel strange to English speakers, because English says almost fell without not, while Russian uses a structure that literally looks more like almost didn’t not-fall if you try to analyze it too mechanically. The safest approach is to learn чуть было не as one chunk.

In this sentence, было adds a shade of almost happened / was on the point of happening. It helps create the idiomatic expression чуть было не.

Compare:

• Она чуть не упала. — She almost fell.
• Она чуть было не упала. — She almost fell.

Both are correct and very similar. The version with было can sound a bit more vivid, expressive, or literary, as if the event was really close to happening.

Historically and grammatically, было is the neuter past form of быть, but in this expression you usually do not translate it separately. It functions as part of the idiom.

Yes. Она чуть не упала is completely natural and very common.

The difference is roughly this:

• чуть не упала — neutral, common
• чуть было не упала — a bit more emphatic, expressive, sometimes more literary

In everyday speech, many speakers will simply use чуть не.

Because упасть is the perfective verb, and here Russian is referring to a single near-event: one possible fall that almost happened.

• упасть = to fall (perfective, one completed event)
• падать = to fall / be falling / fall repeatedly (imperfective)

With almost, Russian often uses the perfective past, because the speaker is talking about coming close to one complete event:

• Она чуть не упала. — She almost fell.

Using падала would usually suggest a different meaning or context and would be much less natural here.

Упала is the past tense feminine singular form of упасть.

It matches она, which refers to she.

Past tense in Russian agrees with gender and number:

• он упал — he fell
• она упала — she fell
• оно упало — it fell
• они упали — they fell

So in this sentence, упала tells you the subject is feminine singular.

The sentence means the action did not actually happen, but the verb is still perfective because the speaker is talking about a whole event that almost took place.

So:

• the fall itself was not completed in reality
• but Russian still uses the perfective verb to refer to that single potential completed event

This is very common after чуть не / чуть было не / едва не.

The most neutral order is:

• Она чуть было не упала.

But Russian word order is flexible, especially for emphasis. For example, you may also encounter:

• Она чуть не упала.
• Чуть было не упала она. — marked, poetic, or strongly emphatic
• Она не упала, а чуть было не упала. — contrasting structure

For learners, it is best to stick with:

• Она чуть было не упала.

They are very close in meaning:

• чуть было не упала
• едва не упала

Both mean she almost fell.

A rough comparison:

• чуть не — very common, conversational
• чуть было не — slightly more expressive
• едва не — also common, sometimes a little more formal or literary depending on context

In many situations, they are interchangeable.

Yes, very often. It is a productive pattern.

Examples:

• Я чуть не забыл. — I almost forgot.
• Он чуть было не умер. — He almost died.
• Мы чуть не опоздали. — We almost were late.
• Она едва не расплакалась. — She almost burst into tears.

A very useful learner pattern is:

• чуть не + past tense verb
• чуть было не + past tense verb

Yes, it does. It is fully natural.

That said:

• Она чуть не упала. is probably more common in everyday casual speech.
• Она чуть было не упала. is also natural, but slightly more expressive.

So you should understand both, and you can safely use either one depending on the style you want.