How do I deal with a friend I’ve not been getting along with?

I’ve not been getting on with my friend recently and I don’t know what to do about it. We normally see each other once, or twice a week, but I’ve been starting to dread her visits. She’s been really good to me and has been helping me work through some problems for quite some time. Recently, however, she’s been offering her opinion on an area of my life (not that I was asking for her opinion on it!) and it is clear we don’t agree on this area. It is causing real tension between us. She keeps saying she won’t say anymore about it, but it keeps coming up. She has told me several times that she is offended that I won’t that her ‘advice’, but my feeling is that even if I had asked for advice, I wouldn’t be obliged to take it. On top of that she is dyspraxic, so she can get rather irate at times. Basically instead of helping with me with my problems, at times, I have dealing with my problems and an irate friend talking about how offended she is and how anxious I am making her. What do I do?