I would not try to necessarily extend the catnap, but if she extends it on her own, then I would let her be and then see if it effects bedtime. As you've heard many times before, all lo's are different. So for some bedtime will not be affected at all with a longer catnap, but some will. When Taylor was consistently taking short naps, often times she would take a longer catnap and sometimes sleep till 6 pm, but then still be able to make a 7:30 bedtime.
See how it goes is my advice :wink: