Remember it doesn’t mean that she will necessarily get that big and not all do
My 8year old common boa is only 5ft she has a large rat every month and has pretty much stayed the some sort of girth as she has been for the past 4years except when she was pregnant
At least with her growing up with her she will get to read her body language and generally boas are slow and quite graceful .the corns won’t be as girthy but some can get to 6ft and are pretty much on the go all the time where at least most boas will sit and chill with you, your shanya will probably stay chunkier than behira as most ball pythons are , yes there is the exception with some overfed boas
Good luck and remember there’s still a few years to go before adulthood for you as a family to enjoy her growing and maturing with you
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