It sounds overly simple, but as a general rule I aim to ignore behaviours which I don't want to encourage. It's not always possible, but its very easy to accidentally reinforce things. In this instance I think ignoring would be the right option. Completely ignore her and pay no attention to her excitement. She'll soon realise the difference between time for walkies and what's happening in the mornings, especially if you pair walkies with a word or action she can recognise.
If you can't ignore her for some reason, try not to reinforce the behaviour. I.e. don't speak to her, make too much eye contact, or treat her when she's excited.
The moment she's quiet or sitting nicely in her pen, treat and reinforce. She'll learn quick.