I don't write fanfiction, so this is original. :-)

To be entirely clear, her arm turned to ice from the elbow down. Then she turned over and slept on it. It was a hot night, you see, or more accurately a hot morning – her arm wouldn't have lasted the entire night. It's not going to last very long in the shower.

As for the specifics of Miriam and Aisha's relationship, I'm going to let you guess for a while. Apart from the obvious: They're definitely mother and child.