(((hugs))) Charli
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This is just MHO so take it fwiw, but I would pump and dump a couple of feeds.
In general, if you're starting from a normal diet and doing a dairy elimination, it can take 2 weeks to get everything out of your system. BUT, you've been strictly eliminating dairy (so no buildup of protein in your system), she tolerates hidden (so minute amounts of protein are ok), and you ate cheese (not the same impact as having a big glass of straight cow's milk, especially since she can tolerate hidden). So I would think that if you pump and dump at least 1, or 2-3 to be safe, you should be ok.
You wouldn't need to sterilize the pump to do a pump and dump, but I would be sure to give it a good wash after
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I hope this reply hasn't come too late for you!