Is this the eldest sister? Unknown

I believe this to be the eldest of the 3 sisters??? And another later photo taken in Keokuk to follow.

Do you know her? My guess is she is a Philby relative. Found in my grandmother, Margie Philby Creed's pictures along with her father, Stirly Philby and grandfather, Samuel Philby's things. The Philby's were all over Iowa, particularly Centerville, but so far no one has been able to identify her. Please review the other photos too.