I have an 8 year old dachshund and he's about the laziest thing I ever saw. Every so often he'll play, but he's happier "resting" on any warm spot. We have a 10 month old dachshund too and she's a live wire - for a while - then she sleeps or "rests" too.

I think it's the breed. They'll get excited when "they" want to. But they are definitely cute all the time.

And I wouldn't worry about being a nervous mom. Shows that you love her and that's a good thing!