Toilet training struggles for 3 year old..

My 3 year old is still doing a poo in her pull-up pants everyday after starting toilet training 2 months ago, she would do a wee on the toilet but just recently she has started to wee in her pants and say she was too lazy to go. I'm 39 weeks pregnant and the smell is making me feel so sick having to change her pants 2-3 times a day. What can I do? I've tried rewarding her with things, or taking her toys away, saying I will buy her a special gift and just nothing is working and I'm starting to get so frustrated.