Thanks so much for the congratulations and advice! I will definitely try to get her a companion. I have a llama that might get along with her. Do you know if horses and llamas usually like each other? I think I'll try it out and see if they like each other. I let her out of the corral this morning and she is staying real close by the house and seems fine. She seems to have settled right in. She's not calling or pacing anymore. I actually figured out that most of her neighing was at the trailer we brought her in. She could still see it in the yard and probably thought she would be taken back to her previous owners.
Any other advice is most welcome as she is my first horse. I'll work her slowly as well since she does have some extra weight there!