Mia Plus One? Maybe?

My parents watched Mia for me when I was in Hawaii, and she had a great time as always. My old dog Jezzi is 13 now, and my sister's dog, Skeeter, is almost 4. Jezzi likes when Mia comes to play because she distracts Skeeter, and Jezzi can have peace and quiet. Mia, though much smaller, likes to boss Skeeter around. It's hilarious to watch them together. Since I sprained my ankle right after I returned from Hawaii, I decided to leave Mia at my parent's house until I was walking again. The idea of being in my little apartment on crutches with my little dog underfoot didn't seem like a great idea. Plus, it gave me the opportunity to clean my carpets (and by "me" I mean the greatest man on the planet, Donald, who did them for me while I was at work. Am I lucky or what?) and rearrange my living room furniture without her oh-so-helpful assistance. 

I'm feeling a little guilty about bringing Mia back home, however. Before Jason left, he was home all day and she had someone to play with. But now she's home alone by herself while I'm at work, and since I have a social life now, I'm coming home later and not getting to spend as much time with her. I'm starting to think that either I should leave her at my parent's house indefinitely, and just go visit her when I can, or I should get another dog so she'll have a friend to play with during the day. I saw her last weekend when I stopped by their house to drop off her medicine, and she's already lost weight from being active (which she really needs to do). I miss her a lot, but I also don't want to bring her home and have her be lonely, after getting used to having other dogs to play with all the time. On the other hand, I'm hesitant to bring another dog home because I don't want Mia to get jealous.

So, what do I do?