May I ask how you saved Amy the slime girl? I stuck at the door to her room and a pinup, it asked a key card but I can't find one beside the one after 1st slime, which used for the gym.
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So, if this still relevant for you: when you reach the door to Amy's lab, just go further to the left. You'll pass "test room 2" and "test room 1", then go down through the door with yellow indicator - it should be open. This is dr. Weber's office, just take her keycard from the table in front of you and go back to the lab.