Puppy being aggressive towards brother?

Oreo is a 7 month old border collie mix, (we were told Australian Shepherd when we got her but she acts almost exactly like a border collie) we’ve had her since she was 4 months and she’s been doing great. She uses the doggy door to potty, knows multiple commands, and spends most of her time on her ledge people watching from the window.

After seeing how well she did around other dogs, playing with them and being very well behaved with them we all decided to look for a second dog to add to the home and started asking around.

Then we got Rex, a 3 year old pup. They did really well together and we brought him home.

Rex has his own area of the house equipped with a crate, bed, blankets, toys, chew toys, etc. that are all his, I want to make it clear he has his own space during this adjustment period.

Because he doesn’t correct Oreo when she bites and nips on his ears, even leaping up on him, he’s obviously uncomfortable and runs away and she gives chase, even following him to their bathroom area outside.

I immediately started correcting her, I make her do tricks and keep her attention away from Rex as he roams the house, or if she won’t listen I put her in her crate for a few minutes until she calms down and if she doesn’t she goes back in.

So far after only doing this for one day they’re able to coexist for around ten minutes before she tries to go after him again.

Am I doing this right? Is what I’m doing helpful in the long run? Will they learn to exist together without her trying to bite him? And is there anything else I can do?

submitted by /u/Ame3333
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