Yes, agree with you. Obviously we don't know much about their employments other than they almost certainly would have been minimum wage or thereabouts. They are also jobs where it is common to be employed on zero hours or part time contracts. If they did have full time hours then it's possible they could have been saving up. We don't know why they came to Scotland or what they expected.You can giggle, it was absolutely intended that way.
I don't necessarily think the family is hiding anything. I think it's very easy to hide things FROM family when you're living overseas, you've only been back twice in ten years, and your only contact us over the phone or Skype. You can tell them things like you're going to buy property, which I have always found extremely unlikely. The sisters were working as a cleaner and a barista and living in an urban centre, they were probably lucky to pay their bills on time and have enough left to feed themselves. I can't see them having enough of a buildup of savings to put a deposit on anything.
MOO
Talk of Eliza losing a lot of weight may also have something to do with this tragedy. Quite likely it will never be possible to know if this was a mutually agreed course of action or whether one persuaded the other.
One thing I find really sad is the CCTV image of them walking. You see them dressed properly to protect themselves against the cold whilst knowing they were on the way to leave this life in freezing cold water. Its really moved me tbh.