All,
The Bush (as most people know her) has an iPhone 5Sx-pad-mini-lightening-black edition thing. I think it's an IPhone 5; it had a metal chasis and back, lightening connector and is phone shaped (fits in one hand).

Thr screen's going, thr battery has been replaced once and it's dying. I need to know what she should get next. Any advice?

Requirements:
Stick with Apple (she knows how it works)
Probably buy off contract.
Don't need thr latest most expensive.
Probably needs to last 2 to 3 years accepting upgrades.
Rather not got second hand.
Cheapest within those margins.

Anybody know these sort of things?

Matt