When I first got bernie,he would wee/poo on our back garden but he got bigger and so did his wee's and with all the rain we've had and plus him doing his business on the grass it's killed it all off and it's like a mud pit,so Hubbie put a fence to block the grass off,so he had to use the paving slabs instead,it took him 5 days to finally do a poo on the slabs,but I wasn't giving in,now he happily poos on the slabs and it's a lot easier to pick up and clean the slabs,so come summer,the kiddies will be able to play on the grass again,so agree,persevere and she will do it