Unlikely from what I can see of the sig which you can't see correctly and is kind of bunched up . She never usually signed in that position on a photograph but check the provencance out but IMO I think its kind of unlikely
Just received the following information from seller, any help?
"hi.. it was originally sold by Chichiorg and the C O A is signed by the director of that charity .i do not know when and where it was signed. i have all the emails from the charity confirming it was theirs originally.regards"
Sadly charity auctions are often full of secretarial and sometimes outright forged items. The COAs from them are somewhat meaningless since I doubt the charity director would know the difference they probably just take the person's word who donates it. I cannot give an opinion since I do not know her autograph at all but I respect both Dan and Michelle above. Hopefully some others here might chime in.