Perhaps its about time to teach her that some people can look after her and not only mummy. My youngest is also the same and I am exclusively breastfeeding her and she would not take the bottle. I try to take it slow. I go out an hour first and stretch it to 2 then eventually 3 hours. And perhaps you can let your parents or in-laws to visit from time to time so your lo can get accustomed to them. Sometimes, it is us who are not willing to let them go. They sense as well that we are not ready. So I guess, you'd have to prepare yourself too and accept the fact that you would have to leave her in the care of other people sooner or later.