Soak the blouse in white vinegar for several hours. Then use the back of a "butter" knife to scratch off the paint. If there's still paint residue, repeat process. My husband got white latex paint on his favorite Camo shirt and let it dry before he told me about it. I couldn't believe it when this method got it out. Good luck!
Bleach will have no effect, as you have found out. I am pretty sure there is nothing that you can use that will remove this. Can you cover the spot with a broach or embroidered patch or something like that?
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