I actually had a budgie named Bluebell and he became completely feral after I trip. The bird sitter didn't treat him like they should have. He was incredibly cuddly and he loved sleeping in my pocket.
The funniest thing is that he is what their chicks would have look like! Wilson was a green peach faced and Luna was a Lutino peach faced. Maybe once I make the double door to my aviary and I have room for a large cage I will get a pair like them. I only have budgies and a pair of cockatiels...
Sad, I'm glad he is in your care now! I'd say just keep them separate like you are and if she does lay an egg as long as she has good calcium she should be fine. I don't have lovebirds any more. But I did have a pair named Wilson and Luna and although Wilson was afraid of everyone Luna was...
I wonder if they'd get along now that she's all broody? Do you want them to breed if possible? I'd suggest you get another bowl for her so she doesn't dump out all of her food or put her food on the ground so she will no waste it.
I'd suggest you give her a high form of calcium like cuddle bone just Incase she want to actually lay. That way she has a much lower chance of being egg bound if she decides to lay. Do you have a male?