I have to do something similar, so I came on your thread.
I moved to a new village to buy and knew no-one. I met a married woman at the back with 2 kids, we became quite good friends, popping in and out, sharing our lives. We were very different in that I am single and childless and work, she is married and has never worked and had a few issues. I didn't care about the issues. I still thought she was a great laugh.
But she would always say 'Oh I don't suppose you could...?' either drive me, lend me, give me, let me borrow etc. It annoyed me. I felt like she often came only to borrow something. She has a whole family round her where I have no parents or brothers or sisters and have to make sure I am alright all by myself. Plus she would be horrible to me if I dared to say no! Once she sent me shitty emails via facebook and said no wonder I was lonely. I left her be for a few months after that, as it was just so needless and hurtful. but I had a dream something bad happened to her, so I went round, that it had happened to her, and we got back together as friends.
I spoke to her about the borrowing and lending and driving and really levelled at her. She said she knew she'd blown it with me the second she pressed send on that email. I said yes that did hurt. She said she had a spiteful streak.
Anyway we were OK for a bit after that, but now it is starting again. Blanking me for no reason. Came round really quickly one night 'Hi can I come round?' and then wanted something cos she'd run out. 'Don't suppose you have a ...do you?' I gave it. I asked for it back, she was iffey with me about giving it back. It was a small borrow but I wanted to make the point.
The change this time tho is that I have a new bf and am often out. But I contact her to say when I am back and can we get together. I missed her. I wanted to tell her all about him and bounce it off her. She blanked me on two nights we had arranged.
Now I feel like you. I feel she cannot be lied upon as a friend. I am sad because I genuinely had a good time with her and I enjoyed being close to a girlfriend, I like the trying on clothes and talking about cooking and watching TV and stuff.
But you have to be able to rely on friends, and in your case even talk to them, as your lady sounds like she just doesn't get normal boundaries! Sorry to hijack your thread, I guess I needed to get that off my chest! I haven't defreinded or anything and I will be sad to eventually do that but I need friends I can rely on, that I know actually like me. I don't think this one does. I feel that behind my back she would slag me off if I said no to a lift or whatnot.