I don't think any of the above would realistically be asked....it would have been Vicky if she was still in it and had accepted the relationship finally...maybe she will come back for a guest stint. That would be cool actually!
Jane is possible becasue she is quite a neutral character who Sharon could easily end up bonding with in the months before her wedding (enough time for her to become a bridesmaid realistically) I think Sam and Zoe are definitely out. Dot and Pat and Yolande and Pauline are all 'too old' really so I don't think they will be cast as bridesmaids! Not in a nasty way, but I think it is usual fro bridesmaids to be same ish age or younger....It could be Chrissie I spose but I think there will be too much tension between them....
Actually it could be Sonia because for a while Sharon is living at Paulines, also Sonia is everyone's friend! And they have got on ok in the past and are kind of related in a way.
Also what about Tina....they could easily be paired up as mates in time for the wedding....
Sonia or Tina or Jane then out of current characters I reckon....she might not have any, she might have more than one...but who will be Dennis' bestman...Andy is dead....he didn't have any other mates.....lest he makes friends with Martin, Billy,Minty and Gary....Jake and Danny....