My 4' female has been in a 4' enclosure since she was 18" long and 150 grams. I kept her in quarantine for a few months at first in a 20 long. Males seem to be more of a worry wort to me. Ive never had a problem with a Female.
I know if you get a 4' enclosure youll be happy, and so will she. At night it allows then to do snake business.. Up all night, Hide all day. I just ordered some more hides on Wed. My 1600 gram 4' girl is in a Large RBI hide. I dont know if you meant $20 each but heres 2 shipped or $21 from RBI
http://www.reptilebasics.com/large-hide-box
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