I love all three of those names.
Meg is my favorite nn for
Margaret, and I like
Daisy as well.
If you had two daughters named
Elizabeth and
Eleanor, I wouldn't use
Elle for
Elizabeth, as it would be too confusing. My little sister
Elizabeth is called
Lizzy, and that is my favorite nn for
Elizabeth. I also love
Betsy.
Margaret Iris is very pretty.
Elizabeth Adelaide is a bit long, but still pretty.
Some ideas:
Elizabeth FrancesElizabeth DaphneElizabeth Claire :-)
Elizabeth Jean (my sister's name)
Elizabeth KieraElizabeth Phoebe
Margaret AnnaMargaret CecilyMargaret LenoreMargaret Eve
Eleanor CarysEleanor LucyEleanor RubyEleanor VioletEleanor VeraEleanor Phoebe