You'll hate my advice but it's the only thing I've seen work.
Wait until they are ready.
When the mare's go into "foal" mode they won't learn, even if you do this every day she won't be sitting there taking it because she is so focused on getting to her foal. All it causes is stress and cements the desire to keep away.
At this stage even a lot of friendly foals keep their distance as well, they come around with time. I just go into the paddock (I get the out of the stable ASAP as I believe the outside is healthier for mum and bubs) do my jobs and leave. Eventually they all come around but forcing the issue before either of them is ready has no benefit.