It depends on whether you are planning hand or machine embroidery.
Machine embroidery - badges/clothing for schools, local clubs (wood turners, Rotary etc look more at the male clubs the WI don't seem to do so and besides have their own in house expertise
)
Be really careful about how much it will actually cost you to produce, in time, materials, electricity, set up costs AND a small percentage of profit to pay for replacement of machinery in the future. Don't forget you also have to SELL the items! that will take a heap of time as well.
I'm pretty sure that Sewing World ran an article about several different ladies who had set up their own embroidery businesses, but it woud have been several years ago - you might be able to contact them to find out which issue it was and buy a back copy.
If you are uncertain about going into this and your daughter is 'sure' it is a winner get her involved in working out the maths and time logistics and don't give up the day job too soon.
Good luck with your research and decision.
Rosemary