I have Tizzie Halls book and she says that once your baby has been on solids for 8 weeks and is sleeping through every night, its then that you give up the dream feed.
To do this, she says to push the dreamfeed half an hour earlier for 5 nights, keep doing this untlil they are sleeping through.
I think Olivia is still very young to give up the dream feed.
Although, I did it for 4 nights and I decided that I hated it. I felt like I was force feeding Jordan. If he wanted to be fed, he would wake up for it. If its working for you, then thats fantastic.
Hope this has helped!