At the risk of sounding like Renegade, I really don't understand the issue here. Whilst it is a bit shit that she is being deported separately from her family, I am sure her family could apply to go with her if they so wished.
Mauritius is a safe country. She came here on a student visa and only claimed asylum when that ran out. Whilst I sympathise with anyone fleeing domestic violence, I am not sure why you need to come to the UK to do it.
http://www.bbc.co.uk/news/uk-england-london-26837257
Although Detention Centres are horrible, inhumane places. I agree on that.