Pretty sure I just saw Fiona Loewi (Lisa) in a Humira commercial...
Humira (adalimumab) is a medication for Crohn's Disease. I'm 90% sure the woman was her.
I think I know which one you are talking about. She is dressed in pink and walking down a urban sidewalk with paintings on display.
She has also been in commercials for McCormick, Flintstones Vitamins and Dulera.