Should I avoid all contact or not?

I have a friend that I used to work with. She is quite a lot younger than me. We used to go out a lot at weekends. Then I moved in with my boyfriend and we didn’t go out that much. Then I was made redundant.

I used to meet her at lunchtimes, but she keeps on and on wanting me to go out with her at weekends. I don’t want to. I told her this and last August she just stopped contacting me. I don’t blame her for this at all.

Other day I bumped into her again. I met her for lunch today, and now she wants me to go out on Saturday with her. I said I don’t want to, but she never hears that.

Shall I just not contact her again?