Something I was going to add earlier... My horses didn't sleep at night much( they weren't stalled) We have too many night creatures for them to sleep comfortably (like oodles of coyotes) so they slept more during the day. I was just thinking that you're girlie may not be too keen on the owls and other night critters so she's nodding off during the day more, well that and it's colder at night, so she may be busy keeping warm by moving about. Then she gets sleepy in the sunshine of the day and naps.
The snow thing is SO funny!!! I can just imagine!
that sleepy eyed look like, huh? What? Every time her nose touched the snow!!!
She's doing great!!! Be patient, spring is coming and she'll be fetlock deep in lush green grass and loving you to pieces!!!