The reason she wants to get her own place (at least what she's told me) is so that she could keep the kids during the week and get them to school. Right now, she doesn't have room at her rent free place. Throw in 3 different school starting times and it's just not feasible at her current location.
If she was 100% in and agreed to dating me exclusively, I don't think I'd have as much of an issue with it. But since she's not given me the indication she's 100% in, I fear her getting her own place would take her 1 step closer to D.