Very good idea! But (haha) in the morning at 7.30, I am usually in a rush to go to work (I know, I should really be getting up earlier, but...) or to tired. I will try and increase the lenght of the last walk.
The thing is, you've posted elsewhere that after this little walk she has, you put her in her "den" and go to work (and she has started to run away when you call her because she knows this is happening). With a longer walk before you leave her, she may well be more tired and easier to settle. Just think, she has just had a long night's sleep, has had her energy levels renewed, and something to eat - she may well really benefit from you getting up just 15 mins earlier and giving her a longer walk first thing.
I have to say I agree with this.... I'm most definately NOT a morning person, and having always worked shifts I was very used to taking the opportunity to lie in until midday on late shifts... but when we got Honey I knew that would have to change....
When she was 7 months old I was getting up at about 6am, to spend some quiet time with her (as this helped stop her asking to get up even earlier!!!), taking her out for her 30-40min walk, having breakfast on return and then doing 5-10 mins clicker training with her before I left for work... this meant she was always happy to be left alone, and now looks forward to the cues for being left....
The couple of occasions recently I've had to go out very first thing before her walk, she really isn't happy to be left at all (these have been for doctors appointments, and she's had a quick 5 mins out, and this is only leaving her for 30 mins or so, but the repsonse when we get back makes it clear she really hasn't relaxed at all... very different from normal).
Growing up we had dogs who were quite happy to get up, spend breakfast with us and then be left and wait till we got home from school before a walk... but they weren't Cocker Spaniels....
Please don't think I'm having a go - but if you could add even 15 mins to that morning walk, and work in some time for clicker training, you might find you have a much more responsive, focussed and biddable dog - a real benefit as you are entering the teenage months!!!