Camp Cot Nightmare

Hi Mama's

We have an issue that I hope someone can shed some light on.
Abi has sleep outs every now and then and when we go on holiday we take her camp cot.
We have never had an issue until the last couple times we have used the camp cot. As soon as you take her near the camp cot she will start clinging onto you, once we put her in the camp cot she will start scrying (scream and cry).

We returned from holiday yesterday and put her down for a nap in her normal cot - not an issue!
When she went to bed she slept for 13 hours straight.

Anyone else had this?
Is the the camp cot or the mattress?

I noticed when my girls were little they love their own bed. If the camp cot is only used every now and again maybe she is just looking for her own bed or maybe the camp cot is making her feel to closed in and confined. a normal cot is a bit roomier and open than a camp cot. how about trying to let her just sleep on a mattress when going on holiday? or for sleep overs?