Am I right to give an Ultimatum?

To make a long story short my best friends mom died a year ago. I went to her mom's house with my friend every weekend for 9 months to help my friend clean the house so she could rent it. So now my mom was diagnosed with terminal cancer 3 months ago and my friend was very supportive at first and was enthusiastic about supporting me because I helped her so much. So a couple of weeks ago we went to lunch and I was more depressed than usual and got a little bit rude with my friend but I appologized and I don't think it was that rude. Also when I saw my friend I was on Clonazapam and I can tell she thinks I am getting addicted to it. So after we left resturant a couple of days past and she never text me back so I had a feeling she was ignoring me. I was right. She blocked me on facebook and lied and said she deleted her whole profile for everyone. So I told her I know that was not true.

she then text back saying she just needs space and she still wants to be friends. So I gave her

She text me a couple of days ago and said that she wants to get together and tell me the real reason she was so upset that day. I quote she said "I owe you that". I want to tell her if we can not continue on with friendship like it was the day before we went to lunch and she does not ad me to FB then it is just going to hurt me so much that I would rather let it completly go untill she is ready to be good friends again. I know that this is best for me to get over my hurt feelings. Am I wrong?