Don’t you mean her deluxe beauty salon in the garden that had been set up as a home gym by the previous owners? Or is there a shed too?
I can just see the set up - the gifted gaudy pink table and Chaz in the corner with a makeshift sink and a hose ready to provide some deep conditioning treatments
If she wants to run a business from there it would need to be agreed with the owner and they’d have to apply for a change of use licence to be part-residential and part-business. Once that has happened it becomes much harder to sell unless it is changed back because most lenders won’t give people a mortgage on a mixed-use property.
Plus she’ll need liability insurance and business premises insurance - I cannot see her making enough as a sole aesthetician to cover those costs given she had to slash prices to cover a few slots last time…