I've had hemangio, but of the spleen. So I can't relate. It was diagnosed midday and my Brindle was gone that night. Never had a chance. But your very very lovely girl, has a terrific chance since you removed the leg. It may not have spread at all. My vet said that if they find hemangio of the spleen by accident before the tumors burst and spread, and they remove the spleen, there is a 97% survival rate.
Hopefully it's that with the leg.
I hope you have many many years left with such a beautiful girl as your Daisy.