Oh no - I'm so very sorry.
What course of treatment, how far to go, when to say 'enough' - these are decisions only you and Touka can make.
With one of my dogs I decided that chemo was indeed the right thing to do, with another I decided against it - it came down to understanding the diseases, the prognoses, listening to my heart and above all, listening to my dogs.
In both cases even in hindsight I can say that I made the right choice - as you will, too. A loving owner knows what is best for his or her dog.
Should you wish another opinion or more information, I can heartily recommend the Animal Imaging and Oncology Clinic, in Hünenberg, ZG:
http://www.aoicenter.ch/
They are extremely kind, very skilled, very understanding - and very supportive of my choices, including palliative care when I chose not to pursue treatment.
My muttleys faced different cancers, so I can't help with the specifics of your disease. But I can honestly say that the chemo was far, far easier on my dog than I had expected - all things considered she was bounced back quickly. But your vet can guide you better.
Two resources that might be helpful are the Dogpages Rescue Forum in the UK ( www.dogpages.co.uk ) There are quite a number of posters there who have experience with canine cancers. Another is the Tripawds Forum, based in the US ( http://tripawds.com/forums/ ) - this is mostly focused on dogs who have undergone amputation, but many have experience of canine cancers and chemo as well. I've found posters on both these forums to be very helpful.
You are facing difficult decisions, I know. From my experience, the best advice I can offer is: listen to your heart and listen to your dog. Touka will tell you what she wants.
Wishing you all the very best - and keeping all our thumbs pressed and paws crossed for Touka.