Im very sorry for your loss. (My puppy looks just like the one in your profile pic.) I've come to learn that dogs are emotionally complex creatures with very real feelings, attachments and desires. Your dog needs to mourn her loss. You can help her by being extra responsive and attentive. Tons of quality time even if that means just watching a movie and maintaining physical contact with her. I think lots of close contact and calm, soothing conversation. Also get out and walk every day even if she doesn't seem into it. I hope that helps.
U should get her a playmate for her. They are free today and tomorrow and then just get her fixed
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