Hmmmm
RE: the food - I think that's probably just her being a cat. As humans get older WE change our likes and dislikes in food.
I know you love her to bits but how about treating her to some chicken or steamed fish or something else she really likes and as suggested already some new toys (I suspect you might have done that) but maybe a new bed is a good idea.
RE: The landing - I wonder if she can still smell Mogs there? or is it cos Spring is in the air and she thinks she might like to go out?
Good luck Tab, keep us updated.
Mary