Ignore your sister. I'm sure it's for her benefit, that she doesn't want to you move, and not yours.My sister keeps telling me she doesn't want me to leave. To be sure before i do anything. Been texting me every single day about it.
She's stressing me out and making me second guess myself. But this saturday i will hopefully be moving all my stuff.
It sounds like your SIL is doing everything to make you feel welcome. If you can spare the money, maybe buy her a gift, as a thank you. Flowers, maybe. Or a bottle of wine. Just something to show your appreciation.