$85.00 is a pretty good rate.
There is a Travel Lodge just north of the UW on 25th Ave NE.
http://www.travelodgeseattleuniversity.com/
This would put you closer to the UWMC. Might be worth a call to see if they can beat or match the Nexus rate.
It isn't fancy, but we stayed there years ago when my grandmother was undergoing treatment at UWMC.

Good luck to your mom.
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