I don't remember when I watched this movie or telefilm, but I remember few details of it:
The setting was modern i.e. 21st century or late 20th century, but the princess didn't belong to this time. Either she was from the past or another dimension.
The princess needed to attend a party, but she didn't have proper party dress by modern standards. She was assisted by a little girl (age less than 10). I remember her funny statement clearly: "My dad told me to use it only during emergency and this is an emergency." (she had pulled out credit card out of closet).
In the party, an evil woman offered the princess an apple which turned out to be poisonous. Upon eating, the princess became unconscious and she had until 12 o'clock midnight. She could be saved only by true love's kiss.