Ok girls, need your advice (kinda long)

So I have this bridesmaid (an old college roommate) who lives in California (originally from NJ), so it's usually really difficult for us to talk on the phone b/c of the time difference. We email back and forth a lot, but I want to actually talk with her. So we said that we were going to speak on the phone yesterday. Well she called me, and I happened to have company, so I told her I'd call her back. Ok, fine.

So, I call her back and I *think* she meant to put me through to voicemail, but she didn't. She picked up the phone and I heard her talking to whoever she was with. Now here's the kicker: She was talking about me, and the bridesmaid dress. I heard her saying to him 'oh it's my friend Laura, I'm in her wedding, she wants to talk about the dresses. They're nice (with kind of a weird tone), they're strapless, long, and.....she's italian, so she wants to put the crystal brooch on the side of it........'

So then he says:
'Oh, so it's pretty cheesy looking huh?'

And then she says:
'Well yea, but when you accept to be a bridesmaid, you kind of just do what you have to.'

And all this time, I'm screaming her name through the phone to get her to realize that I can hear this!!!!!!!!

So now I'm really bothered by this because: (1) W T F does me being italian have to do with anything, and (2) I wish she would've just told me how she felt.

Now I feel like I need to say something. FH doesn't think I should, but I feel like I need to or else it's going to continue to fester. But he feels that I'm risking the possibility of getting into a huge fight with her. My mom says I need to talk to her about it.

I called her back and just left a message (because this time it went to VM) saying 'Hey, it's me....I'm not sure what happened, if you accidentally hung up, or if we got disconnected, or if you meant to put me through to VM, but give me a call....'

So do I say something??? Let her know that what I heard (even though I wasn't really supposed to) is bothering me? Or do I just let it go?