I told my sister I needed time to process something she'd done that had upset me. (For context she went against my wishes and spoke at length to my ex about me, giving him hope that I wanted him back, which wasn't true, and causing lot of problems with him turning up at my house and then lots of unwanted texts. Of course 'she was only thinking of me'. I had already asked her not to discuss me with him earlier that day). I was so angry with her interfering and asked her to leave me alone. I didn't respond to her text saying "how long is this going on" and a few weeks went by. Then she rings my doorbell and hides round the side of the house and parks her car up the road so I wouldn't know it was her. I went outside thinking whoever was there had gone when she appears round the corner, acting like "surprise" and I ended up inviting her in and sharing dinner with her. Now I regret it. I wasn't ready and felt like she took no accountability for what she did. She just acts like we fell out and now it's all forgotten. She even told me about a text my ex had sent her and I had to tell her I'm not interested. Last night she messaged me 11.30pm (I've asked her so many times not to message me late as I'm asleep by then) about going out for lunch together sometime soon.
I had already told her I can't afford to eat out, I'm on PC and money is tight. The message said "maybe we could go out in a week or so". I feel like I'm being backed into a corner because she's lonely and depressed and has lots of health issues (lots are self inflicted). She is always the victim in a situation of her own making. When she phones me she just talks hours about her problems and has no interest in my life . I wish I'd never invited her in but she caught me unawares and I'm not really good at confrontation or standing up for myself. We are both in our 70s and I'm torn between not wanting conflict with family this time of life whilst on the other hand just wishing she'd back off. I'm on the verge of blocking her.