I know you said she's not good with your dogs, but have you tried just one of them at a time? Maybe Angus first since he's a male? Maybe if you and Mark took them in separate cars to a neutral place they could be reintroduced on leashes without problems. She’s most likely frightened of all three on their territory. Just a suggestion. We had to do this with my three little ones. Millie and Granny still do not get along, but it’s more tolerable now that we did the neutral reintroduction. May be worth a try, but be very careful.