Mate contact the two MARA agents above (I'd personally recommend My Access Australia as well), also take solace in the news that the health requirement cost thresholds have been changed. This is likely to benefit folks like your partner with a lifetime condition.
Some info here:
Basically they will need a specialist report detailing their condition and reasonable cost of treatment over X years. A MARA agent with experience in this domain will be able to advise how to do so.
190 ACT | ANZSCO 411711 | 75+5
ACWA skills assessment completed 15 Jun 18
ACT nomination lodged 20 Jun 18
ACT nomination 21 Aug 18
190 lodged 21 Aug 18
Added de facto via Form 1436 12 Nov 18
De facto added by CO 14 Nov 18
CO contact de facto medical/functional english 1 Dec 18
Responded to CO 6 Dec 18
CO contact de facto functional english (already provided) 22 Feb 19
Responded to CO 25 Feb 19
Grant 4 Mar 19
Happy to share my experience with ACWA, ACT, SG PCC, Form 1436.