I nursed and co-slept my daughter for a long time. I was a single Mom, working full time and going to college part time. Because I co-slept and nursed... I never had an exhaustion issue from baby not sleeping. I wish more Moms would be open to such a basic and healthy habit.
Adults do not choose to sleep alone, why would we force our young infants and toddlers to?
Anyways... you also have to keep in mind her age. Not only is she dealing with growth spurts still, but she's learning so many new things and is on the go Go go, that some one on one Mommy time is just what she needs to recharge, relax and start over the next day. This is also around the time where separation anxiety reaches a high.
Please remember - she's still a baby, not even yet a toddler - which is still a very very young child. Don't force independence, unless you want a very clingy child later on.