After gathering the cast information for Asylum of the Daleks, the identity of the other woman is Anamaria Marinca playing the role of Darla. This is found through deduction. Follow:

There are only three women in the episode.

Karen Gillian is 5'11" tall and is wearing flats on the right.

Naomi Ryan (my first guess) is 5'9" tall.

Anamaria Marinca is 5'7" tall.

Our mystery woman is wearing shoes with heels (my wife estimates at least 3 inches high) and is still shorter than Gillian. So, if my wife's guess is correct, she would still be at least one inch shorter than Gillian Using deduction, I am forced to conclude Anamaria Marinca is the woman in this picture.

Asylum of the Daleks: Written by Steven Moffat. Directed by Nick Hurran

Cast: Matt Smith (The Doctor), Karen Gillan (Amy Pond), Arthur Darvill (Rory Pond-Williams), Anamaria Marinca (Darla), David Gyasi (Harvey), Barnaby Edwards (Dalek Operator), Nicholas Briggs (Voice of the Daleks), Naomi Ryan (Cassandra)