Mammy No!! Dominance theory has been totally and utterly debunked. Year ago in fact. Even the guy that came up with the theory in the first place has completely changed his mind. Positive reward. Praise for all behaviours that you want.
Put your female on lead while you feed the other dog. I know you say you can't feed separately but this is causing tension, so if you can, it would be good. Every time your female concentrates on you, treat. Praise. It's not dominance is wanting a resource.
There's piles and piles of stuff on Amazon about dominance being wrong and tons also positive behaviour. I've also done a fair bit of training dogs (no expert) so I will link to all the evidence if you need.
Spends (quite a lot)
£20 Boots.
£45 M&S
£40 Sainsbury's.
off to walk my dogs, lots of treats in my pocket, lots of positive reinforcement etc.
Sorry All, I don't mean to intrude. Just a subject I know a fair bit about in general.
Also post in The Doghouse too, tons of vets and behaviourists on there.