Talk about it…it’s her barrier and sometimes when a person has a barrier they want to keep that barrier up no matter how much you try to convince them that maybe they should take it down…even if just for a short time…
She may surprise you and take it down in her own time…but if she feels you are pressuring her to before she is ready…this could possibly make things worse…
But talking could help her explain how she feels about it…I suggest not in the bedroom…at least you’ll know why one way or the other…
My wife was very apprehensive about anal play but we took our time and built up to it. We started off with some smaller toys and then fingers etc.
Now she loves anal and I’m glad she does. If it had been a bad experience that would have been it.
I know your missus has had a bad experience in the past but let her know you are there to listen and build that confidence back up. Communication is key! I cannot stress that enough.
I would just experiment with things. Have a nose here and see if there are any beginner toys you could get and above all just have some fun with it all.
Sounds like a situation of going slow and steady with having her let you know when she wants it in her own time, but I think what your already doing is ok by keep making suggestions towards it during play as that will allow the body communication to stay open between the both of you