Just to clarifywhy we replied the way we have.
"acting wild, rearing and running" "She really urinated a lot and there was a bit of a sticky yellow liquid on her vulva. Also, she has her head and tail a lot relaxed."
^This sounds like heat. And this (below) doesn't really clear it up because you said " a few months ago"
"Pregnancy signs? 1. She is frequently checking her sides, (looking at her flank). Could be colic.
2. She paces, shakes her head and her tail is a lot relaxed along with the head. Again, could be colic.
3. Her udder is waxy and the tips are a little wet. Could be seasonal hormonal disturbances or pregnancy.
4. Her belly looks dropped and a little fatter. Could be fat but without pictures of the actual horse no way to give an opinion.
It would be her first time to have a foal, I don't know myself.
Few months ago, a stallion was tied outside and she broke her rope, staying free all night. She must've gone to him." The bolding is mine and suggests this happened recently.
Now that you say it was 10 or 11 months then it would make sense for her to be nearing time to deliver and she is in foal. Hoping all goes well with your mare. Personally I think a stallion is not suitable for inexperienced horsepeople, especially the young. I would think your parent would have had him gelded unless your parent has extensive experience and he is overseeing this endeavor.
ETA Curiosity on my part.
Why are they tied at night?
I am also confused by this from your original post "Also, months ago, the stallion broke free from his place and was in contact with the mare for some time. " and then this "Few months ago, a stallion was tied outside and she broke her rope, staying free all night. She must've gone to him." in your second post. IMO it sounds like someone wanted them bred. I am not pointing fingers.
I have flashbacks to my mother in law telling me 1st that my colt accidentally got loose and broke through fencing to get back with his mother. (no broken fencing or signs of fence being fixed in either pasture) 2nd that someone left the gate open and he wandered in because he was lonely. ( that would mean 4 gates being left open considering the spacing between the pastures and our determination to keep them as far apart as we could) 3rd. She just wanted to see them "play". (The actual truth is she is weird like that and doesn't think of the consequences - the colt had a broken hock from a kick from the mare and the resulting foal has severe scoliosis (likely genetic as roach back runs in that line though only one of the close relations shows that tendency and it is very mild).
Last edited by QtrBel; 04-11-2018 at 05:20 PM.