I don't see any problem with that dialogue and no one has reported a problem so I don't know how to help except to suggest you go back to an earlier save file.
Did you have Phredd or Mrs. Phredd take care of your loss of ablilities? If you did, that might be the problem because Tina helps you with those. But only if you have the Loss of Abilities. Check your Ability list and see if you have Loss of Brain, Mole or Heart.