You didn't ask her what she wanted when she came? I would have. I think she was awfully GUTTY to come over asking for your HUSBAND without telling you WHY.

That's something a tramp would do in my book! A lady would TELL the wife why she was there, and what she wanted!!!
Personally, I would ask my husband MORE -- WHY did she show up, and what does he know about it.

For instance, did he promise to fix something in their apartment or whatever? Why did she want him??? etc.etc. I'm insecure too, and that kind of thing would really bother me.
It's probably nothing. That girl is probably not very "nice." But I would tell my husband that I didn't want him going up there when her husband isn't home!!!!
Just my thoughts.