Potty Training suggestions??

Shaquanda
Im having trouble with potty training my 3yr old girl. She's developmentally delayed, so she's not on the level of a 3yr old. I tried using pullups and panties, but she treats them like diapers. She knows what a potty is used for, but she's really having a hard time knowing when she has to go. I have a 5yr who was potty trained at 3yrs old and it only took me a week. Any suggestions on what i can do? How did you do it for your little ones? Help PLEASE & Thank you!