As Mark says, your daughter does not need to bring a springer if she doesn't have one. Any rifle under 12 is fine.
If you did want to buy something beforehand, the rifles suggested above would be perfectly fine.
Or she may prefer to come along, use her PCP, try out lots of other people's springers (there will be a huge selection of rifles there and their owners will be only too happy to let others have a go) so she knows what to buy for her next visit (and you WILL want to come again). And, as above again, there is always a selection of guns for sale at The Bash.