Tammy Wynette cannot be reached for help-Divorce advice
This is clearly way too nuanced a situation to litigate on the internet. If the daughter is the one bringing it up I don’t know how much meaning I’d really assign to that. Kids in these (all?) situations will often push buttons just to see things go boom.
If the kid IS driving it I can’t imagine how the actions prescribed by the ex (weird bed sharing arrangements) would be coming from a place of actual concern. You want to worry about whether or not she feels safe in her own space. Whether she feels like she still has a dad that loves her and prioritizes her and show her how to develop healthy and lasting relationships that provide stability to those that depend on them. None of that is served by who sleeps in what bed.
I’d respectfully acknowledge the concern and move on. Neither your ex nor your daughter get to decide who sleeps in any bed they aren’t in when you go camping or sleep in a hotel room. That’s not a healthy boundary to allow either to set.