It's a case of persevering with what she has been taught. I always carry a pocketful of treats to distract mine when other dogs walk past but mine are extremely treat orientated which makes it easier and they have each other to play with. I know how hard it is to get other dog owners to let there dogs meet yours when they are big so I ended up getting another.
) perhaps one way of dealing with this would be to train and strengthen the 'leave it!' command? you don't need to use dogs at first for this
you can train her to 'Leave' other things (treats on the floor, toys etc) which you can then reward her for with other treats or toys - never the ones she has had to leave
once she is rock solid on this in different situations (house, garden, street, park etc.) then you should find that the command works when you use it around other dogs- don't forget to praise/treat lavishly when she obeys 



> My pup is very good on the lead, untill he see's people - he thinks strangers are for kissing & making a fuss of, so he pulls like a steam train to get to them (he's over 56kg). I always give him the 'sit' command - much easier to controll him when his bum is on the floor
After I posted about him being so good on the lead he has become a nightmare, he has even started flailing around like a mental case trying to get to dogs to play
I was struggling to hold him, so I bought a harness (the type that goes over the chest & shoulders), I use that and his normal collar (2 leads) and it has transformed him
We can now walk past anything, he will still try to pull, but a quick 'check' with both leads held together and he will carry on walking 'nicely'. It had got to the point where if we saw poeple/dogs I would have to stand still to brace myself aginst the pulling and have to use both hands with all my stregnth & weight to keep hold of him, now with the harness & collar I can walk and use only 1 hand to keep control of him (I hold both leads together in the same hand).
I can see it not taking very long to get him in the habbit of walking past peole/dogs without feeling the need to pull, so the £12 harness was a very good investment & I would recomend anybody trying one 
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