I wasn't in exactly the same position but did go through my Mothers palliative care (she was in her 40s sadly) so I know the stress, upset and pain it brings.
I hope your Stepmum remains otherwise healthy, well and recovers as much as she can and send nothing but my best wishes and positive thoughts to you both.
Edz
M:44, W:46, S:10 M 13 years, T 15 BD:23/7/2014 W/S Moved to MIL: 23/7/2014 My new place: 21/11/2014 W/S back to flat 22/11/2014 W coming closer, talking 4/2015 Piecing 5/2015 Moving in again 6/2015