Lew747,
You said your mum has just finished paying off her mortgage 2 years ago and she is not too happy is she has to have a huge sum over her house again. Shock
Do you really really want to put her through the risk?
Tell me to keep my nose out of it but imagine you do get a job at the end of it without swimming too long in the pool. Do you really want her to spend another 5-10 years of her life waiting for you to pay her back slowly? when she could be enjoying life now?