Anonymous wrote:OP, do you ever call your SIL to talk? Or to check in with her? Or to offer something?
It does sound like you call only when you need something. So while her greeting may be rude, you might see what you're doing to help contribute to that. It might be irksome that you only reach out when it comes with a request.
Caveat: My SIL would only contact me when she wanted/needed something, and I wish I sort of wish I had the nerve to respond "What do you want?" Never did. I now don't do anything for her anymore, and not coincidentally, I never hear from her anymore.
This. "What's up" seems pretty normal, to me. Sometimes I answer the phone that way when I know its my husband calling during the work day--he doesn't call just to chat, and we're both busy, so we get right to the point. If you're calling during the day and she's busy with other stuff, I can understand her cutting to the chase.