Poor kid.
I know there will be better qualified people to talk about this.
But just s thought to try.
If she is a high achiever and wants to do medicine. What about asking GP / consultant for some help. Ask them if they would talk to her about her condition as if explaining it to a new med student. She may find it easier to "pretend" that it is happening to someone else. Like this is me and my chrons in a serperate entertiy. I know this help with my Goddaughter when se was diagnosed with nasty condition.
also what about a family friend, aunty, big sister type person is they anyone she can off load to? May be easier than talking to mum as I am sure you are worried about her future and the effects of the condition for her and family at large. Which maybe worry her in talking to you as she does not want to make you more worried.
Finnally I live on high dose steriods for asthama, have takend them for over 12 months before. I assume she is worried mostly about the bloating but PLEASE reassure her that would be very rare in a 8 week dose, and IF it does happen will go with time after she is off the steriods.
I know there are several "femal role models" in the public eye that have chrons. The first one I can think of was a singing coach on that one were the singers lived in a big house kind of big brother meet pop idol. But there are some more.
I also second the idea of see if there is a "newly diagnosed" support group I have been involved with 2 in my life one of brittle Asthma and one of epliepsy and it can really help talking to someone that has had the condition for a long time and has been there done it got the tshirt. I used to get the oddest questions. relating to side effects, drug ratios, what do you do about holidays, how will I cope with my boyfriend, when do I tell my friends. etc people (particullaryl girls) worry about asking dr "embrassing questions" and felt it much easier to ask a buddy. We were also there for crisis time, so if someone was having a sver asthma attack they could call us, we would call the ambulance, talk to them, get them into the right positions to breath, chat away about the weather to keep them calm. We also offered family support etc, and many of us trained as conselers (sp) to be able to help out with the tougher issues.
So give her support, and try to get some outside help.
Good luck and remember this is not a death sentance and will in no time just be part of ordinary life.
It is hard intailly to and everyone with a chronic condition thinks that life will never be the same, and it won´t be but it will be as good as it was befor, and sometime with control (medication, diet changes etc) it can be even better