Gillian Anderson http://www.imdb.com/name/nm0000096/?ref_=nmmd_md_nm
Maybe she is not tall enough, or dark skinbut she can be Luthien mothers. She has develope a strong female character, people that know her work would never think she is weak or unwise.
The hai can be painted.
I nominate Aishwarya Rai Bachchan. A former Miss World (1994, I believe), she's an older (by Hollywood standards) actress who looks like she could be both a love interest and a mother. She has blue/green eyes, but that could be fixed with contacts, if deemed necessary. She's in one of my favorite "fun time" movies, Bride and Prejudice, in which she sings rather well.