Should I get a bigger enclosure if so how big

I have a red tail boa that is just about 3Ft which is in a 3ft tank. If I get a 5Ft or even a 6Ft enclosure would she be ok in it even if I put more hides in it? I know they like to have a lot of hides. I dont want to keep building or buying a bigger enclosure this should be the last time for a long time.

Should be fine for life in a 5x2. Just offer lots of hiding places and perches.