SLEEP SACK HELP

Cat

Guys my little one is 14 weeks old and we just started to transition her to a sleep sack because of how dangerous swaddling is at this stage. My issue is she does pretty good at night and is sleeping through BUT nap time is an absolute nightmare. She CANNOT sleep in her sleep sack and always wakes up crying or wide awake and it’s impossible to get her back down. Her startle reflex is also still terrible and wakes her up. How did you guys do it? What’s the trick? I love when she takes a few naps on me but I need to get stuff done and I can’t even set her down in the sack without her losing it!!!! HELP PLEASE.