
Hi Spike,
In answers to your questions : Yes and Yes :D Firstly she will most probably grow out of it when she has better bladder control - at 15 weeks that's not within her abilities at the moment.
Secondly, you are definitely doing the right thing by not paying her attention as you let her out of the kitchen - the less fuss you make, the less she has to get excited about :P Try and always leave her and return to her in a calm and controlled manner yourself - don't make a big deal out of either - she will eventually not feel the same level of excitement. It's also worth ensuring that other household members and visitors ignore her too when first arriving home or letting her out of the kitchen (I assume you mean from that you put her straight out in the garden to perform?)
Sounds like you're already well on your way to solving this yourself - just needs a little more patience and perseverance.
Good luck, Teri ;)