Potty training

What age did you guys get your kids potty trained? My step daughter is 4 and not 100% potty trained. And I get it, my boyfriend spent the last 3 years going through a bitter divorce, the poor kid was tossed around from dads to grandmas to moms back to grandmas back to dads... you get the point. So I get, getting 3 adults on the same page as to start her potty training was hard, they didn’t start till she was 3 and a half. She’s now 4 and a half and she’ll go to the bathroom by herself but she won’t wipe. She will literally sit there for 20+ minutes yelling “I’m done.” Until someone comes and wipes her. Is this behavior odd for her age or am I trying to treat her older than she is?