Am I being Irrational? (Kinda long)

My sister A who lives about an hour away offered to help me organize. I didn’t ask for the help. She offered back in April after we found out the gender bc I have bins under our stairs of all baby girl clothes that I don’t need anymore. Little by little when I have the energy and my toddler isn’t being crazy I have getting things done because every time my sister says she’s going to come help she sends me a text the night before or that morning saying she doesn’t feel good and won’t be able to make it.

I send a group text letting my mom and 2 sisters know that I started maternity leave (36weeks). She says I can come on Thursday to help. I tell her i got a lot done I just want to pack up stuff we aren’t really using and get the baby’s setup. This morning she calls to me I don’t think I’m going to make it today I just don’t feel all that great. Next week she’s away and she asked what day the following week would I be able to do. I told her not to worry about It I’ll be days away from having the baby (having him at 39weeks). She told me I was being irrational that I wouldn’t have the baby. I said right but I am not going to feel like packing and moving boxes or bins around at 38.5weeks pregnant.