Bottle feeding

I ebf currently. I have tried bottle feeding a few times, especially when we go out I make sure to bring a bottle these days. At first baby was ok using bottle. Took it really well. Then she got sick for a week and stopped taking bottle since then. She cries and just wont take bottle in her mouth at all. At one point she fell asleep crying but wouldn't take bottle, and once she fell asleep i gave her the bottle and she drank it all. When she is awake she wont take it. Any suggestions? We use avent phillips bottles. We tried doctor brown and she had liked philips better.