Thanks all. Actually it's not ballroom dancing, it's acrobatic rock & roll, but ballroom was also on the card. She has danced since just before her 3rd birthday, although ballet & tap when she was at home rather than anything more energetic.
Before DD went to C, we visited her college and spoke to a lad who was in the year above her at school. He studied Engineering, so a pretty full-on course. His advice was that you could do 2 activities beyond your course, but 3 was too much. In her 5.5 years there, DD has done orchestra, chapel choir, rowing/coxing and dance, but also lots of one-off things like helping a musical friend from home by doing some assistant stage managing when he was MD'ing a musical. She has always believed in work hard, play hard, but her health has thankfully been pretty robust. I know she's lucky in that regard and I am in awe of those DC who manage long-term conditions along with their courses.
As far as I know, she's not coming home at Easter, but DD2 and I may well go & visit her. I saw DD2 on Saturday for a couple of hours which was lovely. I need her to sign DF's LPA papers and given the unreliability of the post, taking them to her in person & getting a housemate to witness is probably the safest bet. I just need my bloody annoying sister to send them back from Europe.