The counselling she wants to go for is probably an excuse to prolong the affair, buy more time and legitimise it all her her mind both to you and to herself.
All the while she gets to enjoy both you and OM.
Sorry to sound blunt and please remember, this is only my opnion. However you proceed is entirely up to you.
I wish you the best my friend.
Me: 46 W: 46 T: 23 M: 20 DS12 DD11 DS5
W left: 01/28/08 Discovered OM: 02/26/08 W back for 9 days: 04/08 W returned 05/21/08 EA/PA - 01/08-07/09 W's MLC 2008-2014 (realised this much later)