<human>: Hi dogtraining community!

Ive got a big 1yr old GSP that recently stopped having a major interest in the dog park. When she was a pup, I could take her there and she'd get all the exercise she needs but now, the best way to tire her out is running. BUT, since Im not a marathoner, i got one of those petego bike attachment things to bike while she runs next to me. (I live in an urban area without large dog runs)

The problem is squirrels and rabbits. She is a bird dog and will stop/point/slowly stalk pigeons/birds on walks, but with rabbits and squirrels she actually tries to take off running after them - while on the bike thing this is very dangerous and I've fallen off several times because of her unpredictable attention switch. 

So far, Ive addressed the safety issue by riding a little slower, watching her more, and now the problem is just that she is a total pointing statue and won't move except to try to chase. Even if I physically turn her head she goes right back to pointing when I let go. 

So far the action I'm taking re: training is just to work on leave it WAY more with her. Taking the advice in this article:  But I worry that just like her "come", she won't obey when it REALLY matters. Is it just a matter of practice to make them obey even when it seems like nothing can train a behavior out of them. 

Ive read gun dog forums that push ecollars but I won't go down that route.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Dog tries to chase rabbits/squirrels. Is teaching her "Leave it" really well enough or is there more I can do to combat this?