How old is your little one OP?
My DS was/is a terrible sleeper, he would never sleep in his cot or my bed during the day I had to walk him around in the pram to get him to sleep or hold him because he would fall asleep breastfeeding.
At night used to co-sleep because it was the only way he would sleep and even then it would take about an 1/2 of breastfeeding before he would drift off to sleep. And the room had to be completley dark.
He has always been a night waker, even now at 3yo he wakes several times a night But its easier now than when he was a baby.
So for your little ones day sleeps you could try the pram, even pushing it in your driveway or up and down the hallway might work.
The other place my DS always fell asleep during the day was when we driving in the car.
Also you could try a motorized baby swing or even just carring her in a sling whilst you walk around during the day might get her off to sleep.
Good luck and remember as frustrating as it is things will eventually get easier, just do what works for you and your bub and what you are comfortable with.