Starting snoo at 4 months.

TLDR - my 4 month old has hit the typical sleep regression and I’m wondering if using the snoo is a good idea. We tried today for her first nap, she was shushed successfully to sleep but after waking 20 minutes later was inconsolable and wouldn’t fall asleep again.

More details: my baby was a pretty good sleeper and would sleep mostly independently up until a few weeks ago. Now she will basically only sleep being held or propped up under my arm in bed. We’ve resorted to co sleeping and even that doesn’t work. She wakes up constantly in the night and I probably get one 2 hour stretch. I sleep badly and don’t think it’s safe for me. During the day she will nap independently for about 15 minutes and then wants to be held for an additional hour of sleep (napping like this 2-3 times per day). There are some feeding issues also that I’m addressing with my pediatrician and lactation consultant for suspected reflux. We were passed down our snoo from a friend and I never even plugged it in until today just because she slept fine and I didn’t feel like introducing something I’d need to wean her off of.