Jakabella - yep same here... we don't force her sleep.. if she doesn't want to sleep then we don't make her... she must not be tired enough and as i said below, we then try again 15mins later....
My situation is a bit different to your's though, your DD has quite often slept through the night (correct me if i'm wrong!).... so if she doesn't sleep through the day i guess it's not as a big deal for her....
if my DD has been up 2hrly all night, i NEED her to sleep during the day too... kwim?? lol
so i can get rest.... but her day sleeps are great.. she has two big day sleeps (most days) so im really lucky. (1hr and then 1.5hr most days)

just getting her to sleep is our problem at the moment... but im sure it will pass. oh, that and the frequent night wakings....(not always teething related!)