If you are worried I would go chat to your GP.
Personally, it sounds normal to me. Baby poo can be all manner of shades and consistencies, but from my understanding you really only need to worry if the poo is nuggetty (constipation), devoid of colour (basically white) or frothy (and even then that's just sometimes an indicator of lactose overload and would be associated with tummy pain, lots of screaming etc. ... and come to think of it more of a symptom for BF babies?? Not sure.)
I think that if bubs isn't really crying like she's in pain then probably she's just a snacker and a napper. I have only partially FF one of my babies and that was only as a supplement to BF as a 6-ish mo so I am not the most experienced. But there may be ways that you can gently encourage distance between feeds. However as for getting a napper to sleep longer - I am at a loss! Both of mine were cat-nappers and I just decided to roll with it cause I couldn't be fagged trying to encourage longer naps. But I know there are others who have had success in these endeavours so I would never say 'don't bother' if you find the cat napping really troubles you. You may find she will settle for longer periods in a sling close to your body. This might be a handy way of getting other things done around the house, and maybe if she sleeps a little bit longer she may wake more hungry and want a larger meal?
Other alternatives... Maybe she is going through a wonder week and is just a bit unsettled? Do you think she may just need cuddles sometimes instead of the milk?