When splooge dries it's lost it's water content (that do be what drying is) leaving behind the protein and such

Adding heat energy to something without a liquid component will only create liquid once it's hot enough to melt, it won't magically re-add the missing hydration

If she'd added a little bit of water to the sock, wrung it out, THEN microwaved it, shed be closer to what she's after

Basic science, really