Can't do anything right by her...

I'm in an 18 month long relationship with a 46 year old woman and I'm really struggling. Whenever I try to support her when she's going through something in life I do something which she deems as not supportive. She is awaiting blood tests and I said she'll feel like a weight will be lifted when they come back - She replied with "do not tell me how I will feel"

I bought her the same species of tree which she loved in a neighbours garden for her birthday and planted it (I've never been a good gardener)..after an hour slog and me putting back picking my kids up, she came outside and saw that it was 2-3 inches off centre and said "that is f**ing s*t"... she went in a tirade of saying I should have researched how deep to have planted it and shouldn't have asked her.

This week after two telephone conversations with a lot of long pauses and moments of silences I asked if there was anything else on her mind (tbf to her she is stressed, with work, car problems and waiting on blood tests) she replied with "why are you turning it onto you and us?" We tried another phone conversation the following evening and she repeatedly interrupted and talked over me so I raised my voice to be heard (not shouting) and her response was why are you shouting? I told her she was extremely difficult to talk to and she just hung up on me...I don't think anyone I know has heard me shouting including ex partners.

There are many other examples I've got and she has always had justification for her behaviours.

I honestly feel that whatever I say she twists and manipulates things into which ever narrative she has formed in her head and feel like I'm going mad.