Hi, M.!
My daughter who's now 2 was the same way. She slept through the night from 8 wks. to 11 months (only 10-11 hrs.) but she never took long naps during the day until she was almost a yr. old--no matter what I tried. She'd go through stages of sleeping for 30 min. at a time, 1-3 x's a day for several months until she was almost a yr. old. She was also colicky until 4 months old, which was the hardest thing I'd ever gone through. Then, right before she turned 1 she'd start taking a 1 or 2 hr. nap twice a day until 15 months, then would take one 2-3 hr. nap a day until 20 months old. Now she takes naps sporadically (some days none at all--and she goes to bed around 10 or 10:30 and is up at 9:30 or 10 a.m.)because once we brought our new baby home (in Dec. '07), she just didn't want to take them anymore! She'd scream when I put her in her bed to take naps, when before she willingly took them with no problem. It was very frustrating, as I desperately needed some time to just tend to the baby (or myself!) and she refused to nap, no matter what I tried. Now she'll just take a nap when she gets tired and just hops up on the sofa and falls asleep. She's never been a child who needed much sleep (like her daddy). For the most part, she's always in a good mood and not cranky--besides being a female, with all the drama.... :). I also have a 15 yr. old son and I don't remember him having ANY sleep or nap issues...he was an angel! So, she threw me for a loop. My 4 month old son is a breeze and I think he's going to be easy like his big brother. But, my daughter has been quite the challenge, to say the least!
I would wait to see how she acts during the day with the short naps. If she seems content and not fussy, then maybe she just doesn't need the extra sleep at this point (which is what I found to be true with my own daughter). I do know that when they're going through growth spurts they tend to sleep more, too. If she's getting plenty of sleep at night, I wouldn't worry about it at this point. She may all of the sudden start napping for longer periods in the next few months....you never know. Believe me, I know how you feel at this point! I had my daughter when I was 35 and my oldest was 13--I was thrown for a loop starting all over again! In some ways, I think it's easier being older (I'm a little more patient) but then again, after so long of having an independent child, it was hard to get back into the game w/a little one...now I have yet another baby (not planned, but is such a joy). It's challenging a lot of the time, but keeps me on my knees where I probably should be anyway! :)
Good luck with everything!
A.