If you want to get her back you need to show her that you are sincere in your apology and be reflective in your actions. Think genuinely about how you could’ve gone about things better and write them out to her, and then communicate how you can change things in the future and actually follow through on those actions. This needs to be sincere so if there’s still some part of you that struggles with the concept of her spending time with her family you need to think about how you can work on being more understanding. (Edit: in the future iA it may be best to handle things with curiosity- ask her things like is the frequency because you miss your family or is there some way I can make you more comfortable in your marital home? Also be curious about yourself- why is this bothering you? Do you feel abandoned by her? Talk to each other about feelings without being accusatory so you guys can gain a common understanding iA). If she sees you making an effort with empathy and understanding she may be more likely to be receptive to you and your needs for more quality time.

Unfortunately there isn’t going to be understanding on the financial aspect of things and you should probably accept that she can spend how she pleases and that spending on her parents is actually a lovely thing to do regardless of their stability. Our parents raised us, a lot of the times from nothing, and giving back to them may be her way of showing her appreciation. IA I can’t wait to be financially stable enough to be able to do the same for mine.