SIL Drama (need advice)

Bekah

so I am currently 34 weeks. my baby shower was on 2/18 and it was a surprise to me. my SIL and MIL threw it for me, which I'll be forever grateful for like it was seriously the sweetest thing. my SIL is done having kids but still had all of her baby items so she gave them to me. For the shower I only needed basically clothes, diapers, and wipes.

Well at the shower, my co-workers decided to pitch in and get me a Graco travel system stroller/carseat combo. they knew I didn't NEED it but wanted me to have something new and something big to show how much they care for me (their exact words, how sweet) I couldn't have been more excited.

My SIL could not be more pissed off that we got the combo. Since we already have at the house all of her old baby items, she said if her carseat and stroller isn't good enough than none of her stuff is. She is demanding we take back the combo from my coworkers or she is taking back everything she gave us. (crib, dressers, highchair, literally everything but clothes diapers and wipes)