I think that's good advice. I wouldn't ask her about it, because she might be embarrassed or shy. She might realise that you saw it and is worrying about it, too. Just show that you care about her as much as ever and you aren't embarrassed yourself.

I think it is something she might not be able to admit to unless she's willing to say it aloud to you. And she may not be brave enough to do so unless you say it first.

But whether you're willing to do that is something for you to decide.