2.5 - 3' at 10 months old is unusually large for a boa, even a fast-growing common boa. How often and what are you feeding her? If she's already on prey items such as adult mice, she should only be eating every 3-4 weeks.
If you'd like to get an accurate measurement of your snake, look up the "measure my snake" website. Follow the directions there and you should be able to get an accurate reading.
Like bcr229 said, most boas outgrow glass tanks. I'll even go out there and say that your common morph-type boas always do (especially females!). If you have a female common boa, your best option may be to order a 6' enclosure now with a center divider -- that way, you'll already have her lifetime enclosure, with the option to divide it into a 3' grow-out enclosure! Animal Plastics (the enclosure maker bcr229 was alluding to) has been the go-to for many years, but the extremely long wait times they've had recently have turned some people off. Alternate enclosure makers I know of include Kages (from whom I have a 4' enclosure), TerraOrb, Custom Reptile Habitats, Scale-Box, MP Cages & Exotics, Zen Habitats (4' models only), and Focus Cubed Habitats (for an extra fancy, pricy option). In general, look for someone who's using at least 1/2" PVC for their enclosure construction -- anything less isn't all that sturdy.
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