Mare runs away from me
I got a pregnant mare (not a maiden) 2 months ago. She is 6 and has been a broodmare all her life. When I first got her she would let me catch her, halter her, lead her, etc. Then she started to run away from me. This may be because the one and only time I reprimanded her (with voice and a hard slap) was when she tried to nip me. So the next time I caught her I left her halter on so I could still catch her with a carrot when I needed to.
She had her colt 8 days ago and now she won't let me near her, or her colt. The birth was not ideal - I missed the actual birth itself - and the colt took ages to learn to suckle. In the end, and after trying for a long time to get him to suck from his mum with no result, the mare was getting sick of it all and I had to call the vet to give him an enema as he still hadn't passed his first movement. The vet also gave him an antibiotic injection. The mare was tied up and hated every moment the vet (and I) handled her colt. She got so upset that the vet gave her a shot to calm her down, as well as a pain killer (as she had just foaled a few hours earlier). Because the colt still hadn't suckled and needed to get some energy we had to milk the mare to get some colostrum into him with a bottle and to teach him to suck. He finally got the hang of it and after 48h of observation in a temporary pen, we let them both go into the paddock.
Since then, the mare has been very protective of her colt. Whenever I come close, even with a carrot, she shies away and herds him away from us. I'm worried because the colt needs handling and she is teaching him to fear humans. I tried to catch her again today but she got away again, which is only reinforcing the problem.
I don't know what to do now, or even how I will catch her again. The last time we caught her we tricked her into our newly built 6m x 6m yard and closed both gates on her. The paddock is about 2 acres so there's no point in chasing her around and I think she is too clever to let herself (and her foal) get trapped in the yard again. I feel extremely frustrated (but don't show this to her - I stay calm and soothing).
What should I do?