It could be that you are going round in circles a bit here,the confinement could be making her worse :-?
Mine have 2 good walks a day although the morning one is usually only 30 mins- 1 hour I have heavy balls on ropes which I throw for them(they go for miles) and when we get home they can barely breathe and they flop out,if I didn't do that they would get into all sorts of mischief :)