yes itz normal to have weird periods post D&C,she may face longer/shorter periods,less/heavy bleeding for about 2-3 periods post D&C,it can be irregular also.I had D&C and my first period post D&C was heavy and long and 2nd period came at about 19 days apart from 1st period so it was really weird for me but from my 3rd cycle it was normal
Her cycles may vary for the next few months as her body finds a balance after the D&C. If you are unsure, you can always call and talk to her doctor too.
its normal, she needs to wait a couple of.months for her period to get back to normal.