protection or anxious

I have a lovely short leg staff called domino (or top guns lady if you go by her full name) she is a lovely little cheeky girl but just lately when out and about she's becoming very snappy towards other dogs even though she lives with a doberman cross and sees my brothers dog on regular occasions. With the staffy reputation she's doing her self no favours bless her cottons even though I reassure her it's all ok and to be nice she looks and listens but then becomes snappy again even more so when my children are with us. I don't know if she's protecting her companion or me and the kids or just generally being a moody moo.. she's has been neutered so not time of month. But we did have a situation where another dog walker didn't listen to me when I asked her to wait whilst I got her on a tighter lead and she didn't listen and tried to come passed me whilst I had the pram and my other dog, her dog curious to see mine came over in her face and mine snapped at her dog catching the tip of her dogs nose didn't leave any marks but since then she's not been great with other dogs becomes impatient if that's the word I'm looking for. I need to get my girl happy again with other dogs bless her. Any advice wud be great please

Hi and welcome, do come and say hello here when you get chance    

https://staffy-bull-terrier.niceboard.com/f7-new-member-introductions

I'm going to move your post to the training and behavior forum where more people will see it and can hopefully help you x