Guess She Doesn't Want My Help Anymore

I tried to leave both of my previous job correctly.  I provided each manager with a resignation letter and worked until the last possible day.  I wanted to leave on good terms in case the new job does not work out.  I made it clear that if I had any free time I would reach out to the old jobs and assist until they were properly staffed.  My retail pharmacy manager was thrilled to hear this and indicated that even if I only work a couple of hours every other week that would help.  Yesterday, however, my manager at my fast food job gave me a vibe like she was done with me completely.  I went by the store to tell her how my day went and to let her know about a employee who is coming back to the area and wants to work again.  I left the store and headed home.  She texted me and asked if I had left my keys to the store.  I had honestly not even thought about the keys.  I returned to the store after a while and gave them to her.  The fact that she wanted my store key kinda made me feel like she doesn't want me there.  That's fine. Life goes on.  I guess she doesn't want my help so I'll use my talents elsewhere.