Join Date: Jun 2017
Location: middle of nowhere
How big of an enclosure is she in? I'd put her and mom in a stall or small pen, and sit in the corner. If a couple of days of that has not resulted in any progress, you may need to corner her (gently) and catch her, then rub and scratch on her to show her you won't hurt her. She's small enough someone can kneel and hold her with an arm around her chest and an arm around her rump and keep her still. If she's completely wild, pick her up and she will calm. While she's caught, slip a halter on and off several times. I wouldn't leave one on her as it's easy for it to get caught on something, but the advantage with minis is that they are small enough to catch, then halter. Work gently on teaching her to lead-- you don't ever want her pulling hard or plunging around on the end of a rope-- it's far too easy to damage her neck this way, but apply some gentle pressure, then release instantly when she follows. Leading mom and having someone lead the foal behind her can also help her get the idea once she's yielding to pressure in her pen.
If you MUST get meds into her, then you catch and medicate her by whatever means necessary, and work with building trust again later. Don't let her go unmedicated because you can't catch her. She's small enough you can hold her to administer meds if need be.
Good luck with the little cutie! Minis tend to come around fast once they realize it's ok. Go in and catch and hold and scratch her several times a day. Do it a lot more than you medicate her.