You can talk to her about it, and maybe come to agreement about it. If leaving the house is part of what you struggle with, I'm sure she'll understand, but may want to have a certain amount of notice/fee arrangement so it doesn't impact her income too much if it happens a lot.

I skipped a lot of sessions when I first started trauma work, my therapist at the time told me he'd hold my hour for me whether I showed up or not, that no-showing wasn't going to make him drop me (aka "You're not getting out of this that easily."). That gave me a bit of a kick to go there and get to work.