I've met attached women who's first thing (after they looked at me and sensed my intention) was immediate talk about BF/Hubby. They built their barriers up, perhaps to chase me away? So I don't think that is unusual, I guess they are only protecting themselves from critical society eyes. However, I also noticed that at least once, after she discussed her significant other and I totally ignored it, she gave me quite a big window. For the first 2-3 times I was confused, ripping my hair out because I didn't expect it and thus missed it. Usually PUAs recommend to swich the topic immediatelly or leave, but I let her talk and talk, as much as she wanted, while I didn't really expect anything from her.
I would recommend to ignore the talk, othewise she will make an emotional tampone from you. Don't understand her problems, don't agree with her, look away with bored look...