I think Maz and Sid were fine when it was a fun relationship with no strings, like she wanted at first. Then after she didnt' die, it became all serious and like they've been married for years, getting bored with each other.
She managed Dex/ his crush/ Mitzi etc very well, but I don't think she's done anything for Indi. She seemed to take Romeo's side in it all. But I suppose she did live with Romeo for a while so maybe feels like he's her son more than Indi's her daughter. Complicated I would have taken Indi's side personally. In fact, Indi doesn't have a mother figure really.
I think if Maz splits up with Sid, she should move in with Irene (if there's room). I was going to say she should move back in with Miles and co, but the Nicole situation wouldn't be good in that case.