High lipase

How can I help this or mask the taste. I pumped milk a while back and my baby has refused it all. It has that soapy, sour taste. I’ve heard adding some vanilla extract can help, has that worked for anyone? which one do u use bc I’ve read it has to be alcohol free. I don’t plan on pumping a lot so I don’t think I have time for scalding it every single time before freezing. Sometimes I need to go out and want to thaw some of my frozen milk so I can leave her knowing she’ll take it from the bottle. She has refused the whole year my milk in bottles.