help me find the name of a book!

This is a long shot but I’ve been extremely desperate to find this book. When I was younger I read this book that takes place on a Native American reservation with two sisters and I vaguely remember the cover having shades of purple and blue but idk. All I remember is that there’s two Native American sisters and their mom is pregnant and she keeps eating a lot of hot sauce. I really wish I could remember more but with these details hopefully someone can somehow guess what book I’m looking for. Thank you so much