Ok to ask her former work ( co workers ) what happened to her?

i had talked to her there numerous times and she did work there until a couple weeks ago then she disappeared. i know she's still friends with some of the girls who work there as i've seen pictures of them together on social media. so they obviously know the story as to what happened and why she stopped coming in.

note i haven't talked to her since she left and not sure if she is avoiding me or we just haven't talked cause she doesn't work there anymore. she is taking a course or something school related in septemeber so she wasn't going to be here anyways but she left work a couple weeks early for no reason

is it ok if i ask one of these girls about her and see if they can fill in the blanks as to whats going on with her?
Ok to ask her former work ( co workers ) what happened to her?
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