Baby refusing bottle-help!

My baby is 7.5 months and has recently been flat out refusing the bottle. She will eat solids but no milk :( I've tried giving It to her in a sippy cup and she still doesn't want It. 
My doctors office is closed right now so I'm here asking if anybody else has  gone through this? It is so frusturating and I'm scared she will get dehydrated. 

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