Transitioning to Merlin

I tried moving my 11 week old to a Merlin Sleepsuit. Half the time she manages to get her arms out of the swaddle so I figured this would be a good alternative. The first 3 naps went great. I swiftly laid her down in the snoo once I rocked her to sleep and she slept 1+ hours (usually I have to bounce her on and off until she’s dead asleep, lay her down slowly to keep her asleep and I get 35 min max). Now this last nap went terribly. She woke up, snoo didn’t get her back to sleep.. tried again. Now I have an overtired baby that is fiiiinally sleeping on me but still won’t let me lay her in the snoo. Any tips? Please 😩 I’m afraid for overnight now.