Well I would persevere with the lead/collar for a bit. Don't make a big thing of going out- get yourself ready and then just quickly clip on the lead to the collar from behind. You will find that once you are outside the distraction of the great outdoors makes her forget about the lead as she will be busy sniffing and looking at everything. We have two schnauzers- one has lead and collar. The other has a harness as he pulls too much on the lead and has choked himself doing this so we switched to harness- but it is a nightmare to put on as he hates having a put over his head and will reverse all round the kitchen if he sees it coming towards him. But once it is on he is really co-operative, lifting up his legs to get them through the straps to go round his tummy.