My daughter did go through a period of milk strike. Her lowest intake was around 450ml. What I did was try to feed her while she was asleep. Occasionally she will reject the bottle, but I will keep wiggling the bottle in her mouth until she drinks. Another method you can try is using a syringe to feed.
Please remember to monitor her diapers and ensure she is not dehydrated.
Hope this phase goes away soon!
Read more