Hi there ... can't help with groups in your area, hopefully there will be someone on here with that info ... but I just wanted to say, what an amazing daughter in law you are ... 

Sadly grieving can take all forms, and having treatment she's not happy with, makes it worse .. there's a good book by Paul McKenna called how to mend a broken heart, for all forms of losses ...he shows you how to bring good memories out and push away sad ones ... it really helped my other half, 15 years ago when he lost his wife to breast cancer, and he couldn't get the picture of her at the end out of his head .. he followed the instructions, until he was left with the funny things she did, and all the wonderfull memories she'd shared with him ... and with a wonderfull daughter in law like you to hold her hand, she will get there ... but remember it's only 8 weeks, and that's still in the raw stage ... the more she can talk about him, even bringing a few tears, will help ... we still talk about my partners wife occasionally...

Hopefully you'll get some other ideas on here to from others ... take care ... chrisie xx