I am going to loan a pony, and I am not sure about putting her in a paddock with another pony who wears shoes?

I have a loan pony arriving soon. At the yard is a cob mare. She is the dominant pony with a gelding that is currently there (soon to go). Because the new pony will be a loan, and of fine build and has been stabled 80% of the time, I am weary of putting her out with the mare that is already there. The existing mare and gelding have been known to tear up the paddock with cantering and bucking. My main concern is that I want to avoid the new loan pony being kicked/injured by the other mare, which wears shoes. I have read that equines can socialise over an electric fence (not always switched on as it is a secure field) and do not need to be in the same paddock, but can happily live in the paddock next to each other and still be able to see each other and groom the other equine. Would be interested in your views..