What does it mean when a girl suddenly leaves after seeing me talking with another girl?

Why would (girl2) react like this after she saw me talking with a girl from a distance?

Was (girl2) annoyed?

Context:

I'm at an office trying to get a computer working (it's an old computer and the internet was slow), suddenly I see a female friend (girl1) that I haven't seen in a while (because she kind of disappeared suddenly without any communication. We try our best to catch up in a short time that we barely had (less than 10 min. because of her work) and we take a seat in the meantime.

While I'm talking with (girl1), I notice that (girl 2) was slightly far away (but she can't hear our conversation). Suddenly I'm seeing (girl2) in the background and I notice that (girl2) is looking at us and then, (girl2) sighs and leaves the area [by being out of her sight from us].

(girl2): I've known this girl for 2 months, she likes to look at me when I'm not looking at her, looks at me from a distance, had placed her hand close to mine (while she's distracting me with another thing closer to my face) multiple times but when I try to see it she moves it away quickly, she usually spends most of her time on her phone watching tiktoks, she wanted to impress me a few times, when I'm talking with another female friend she had gotten into a conversation and was asking a few questions to the other female [even if she had previous boyfriends], she had gotten next to me when we were at lunch.

What does it mean when a girl suddenly leaves after seeing me talking with another girl?
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