Advice re what insurance needed for loan horse please x

[Ticktacktock]

My daughter has the loan of a pony for the summer. She is a pc member, so has some insurance automatically through them, although I find it hard to understand exactly what, and the helpline is closed today.

What insurance do I need to get please? Where is best to get it, and anything else I should do?

Thanks in advance, she is sooooo excited!