At 7 mos, she'll be fairly big (I'm assuming she's a horse), so hopefully she hasn't learned any bad habits :)
With foals, from birth we put a halter on them and start teaching them to lead pretty much as soon as they're walking well. We never let them jump and play while on a lead rope, and we never let them "horseplay" with humans. When they're used to the halter/lead rope, we start getting them used to grooming--curries, brushes, towels, etc. We pick up their feet, and when they're comfortable with that, tap the feet with a hoof pick. We also go ahead and start teaching picking up feet from the same side (as in, pick up the right hoof while standing on the left side).
All that to say, the weanlings I worked with knew all of this. Since your baby is halter broke, I wouldn't say it would be a big deal to (slowly) go back and teach any of those things.
I'd be working on lots of ground work, although keeping sessions short. Seven months is still very much a baby, and she'll probably have a relatively short attention span. If you have the time, I would suggest 2-3 fifteen or twenty minute "work" sessions a day. But keep in mind that babies do nothing but learn, so anytime a person is handling her at all, she's learning something from that person.
I really like babies to be stall boarded too--not because I think they need to be in a stall, but leading them in and out gives them a chance to be handled multiple times a day in a routine setting.
Those are my personal preferences; there's lots of different theories of course. Good luck with your baby and keep us posted!