What color is her dam? (Her sire doesn't carry cream, and her dam doesn't have a color attached to her on allbreedpedigree.com... if her dam is not a cream (buckskin, palomino, or smokey black) then this mare is a chestnut.
To be honest, she looks more chestnut to me. I have seen some dark palomino's (DNA tested), but most still had a distinctive golden sheen (not all of them though... I've seen photos of a DNA tested Palomino who LOOKS black - so there are certainly exceptions). If you can't get the information on this mare's dam, and her color is important to you - do a DNA test.