Judy's mom prepared 30 sandwiches in total and added chicken breast to 25 of the buns. Therefore, she made 25 chicken sandwiches.
However, the options provided (18, 12, 14, 16) do not include 25. Based on the information given, the number of chicken sandwiches made is 25, which doesn't match any of the provided responses. If the information given is correct, none of the answers are accurate.