Only sleeping while being held?

Meryn

My LO is 4 months old and is really good at fighting sleep - recently only wants to nap in your arms. She's good at bedtime but naps are hard. I'm learning she likes to side sleep so I think that helps while she's being held. Any advice on getting her to nap during the day? As soon as I put her down -crib, bassinet, swing, rocker - she wakes up after 20 min. Which leads to being overtired and the cycle continues.