There are several lipsticks/lipglosses that could definitely be dupes for her lip in that picture. (Stunning picture of her, BTW)
I would definitely look into the following lipsticks/lipglosses...
Yves Saint Laurent Rouge Pur Shine in Natural Beige
NARS lipstick in Belle de Jour
Givenchy Rouge Interdit Satin lipstick in Only Beige
Make Up For Ever lipstick in Sand
Too Faced lip luxury in Totally Nude
Laura Mercier lip colour in Nude Lips
NARS lip gloss in Striptease
Lancome Color Fever gloss in Nude Prainha
Guerlain Terracotta Gloss and Shine in Beige Sun