@Struckbylightning how long are your walks at the moment? It may be that she needs longer ones. Is there somewhere you can take her to let her off the lead as well? I had Pablo off lead from day one - someone on the adolescent thread said he wouldn’t want to wander too far from me when a pup and they were absolutely right!
On the puppy proofing - I bought a pen for Pablo in the very early weeks but he could climb out of it from day one! So now, one side is attached to his crate and I have kind of run the rest of it up against the wall so he can’t get to the curtains, wires or books. It’s difficult to explain but it works. When in September do you need to start leaving her for and for how long? It really needs to be built up over time. I started with flitting in and out of the room from day 1, built it up very gradually after that by closing the gate over the kitchen and literally walking out of sight in to the hall, standing there for a few seconds and then coming back in to reward for being calm. I dunno if that’s what did the trick but eventually, over a long period, we got up to a minute, then 5, then 10 etc - I sat in my car and watching him on the pet cam once we were up to that point to see what he could tolerate and carried on building up from there.
I think you just need a plan, it may take a rearrange of some of your stuff and furniture, moving as many things out of her way as you can, trying to protect the rest and then decide on how long you have to get her to where you need her to be and work on it daily.
Failing that, is a dog sitter an option?
I know what you mean about efforts sinking in! It feels like you’re throwing a Hail Mary sometimes when you’re training - doing the same things day in day out until one day they show you that they were listening after all! Pablo is 5 months old in two weeks and we’ve gone from him pulling towards every human and every dog to now actually walking to heel past them. I never thought we would get there! He’s also not jumping up at people anymore, something else I thought would never happen. It’s amazing when it clicks in to place and it definitely will, she’s a clever pup!