What would you do?

I’m in my 30s and married.
I care for my child most of the time and work part-time.
My wife has always been a workaholic, but recently it’s been really bad, like sometimes she just comes home to sleep and we barely see her. We could afford for her to work less hours, but she always works as much as humanly possible.
When she’s home she won’t help around the house at all or even pick up after herself and it gets frustrating. I try to talk to her about it, but it turns into a huge fight and she threatens to leave and worst take our child with her.
I love my child more than anything and I’ve been the primary caregiver for many years since I quit my full-time job to make sure my child is cared for. I’m scared of not being able to look after my child all the time so I just keep my mouth shut even though my marriage is challenging.
I really have tried talking to her, but she’s as stubborn as she is beautiful and she’s stunning. That’s partly why I fell in love with her when I was young. Now I’m just confused and not sure what to do or how to feel.
Any thoughts would be appreciated, thanks.