perwsonality change in cooler weather?

[pets4life]

my dog is from slovakia so shes use to colder weather shes gonna be 2 years old in 2 months

i notice the past few weeks though shes been going out less and less interested in what goes on around her, i had her own special dog door built in the summer (i lock if im not watching) so if she goes to her room she can get indoor and outdoor as she pleases

she use to rush in and out of the house a lot like to see what is going on and be on top of stuff but recently she stopped doing that and spends a lot of time in her crate unless i go out with her which i do daily to exercise her then she will stay out as long as i am there because shes running intenslly

also she changed postions she use to like to sit in front of the door to watch people but now she goes and sits where the sun is right on her is the cold bugging her ? making her not wanna go indoor and out?