Oh that sounds brilliant! A really good find. She will probably try and chew at the bottle hole so try and find something to block that off with (a large nut and bolt would do it or some kind of screw in chew/toy like this one
https://www.amazon.co.uk/Parrot-Wood...F6GJGRJSPYXPHE
The maxi duna is a lovely cage. And if you wanted to sell the Hamster Heaven once she is settled, you should get a decent price for it second hand.