Sometimes body language is just as important and sometimes more important in matters of love.
She gave you a hug and you feel "loved". I have known some people that say they love me but their hugs are "empty". I certainly did "feel their love", even though their words said : "I love you".
Consider you telling her you love her as a "gift". We don't always receive a gift back when we give a gift. To me, it's more fun to get something unexpected.
Not knowing your gf, it's hard to say what she is thinking. Maybe she has been bitten in the past by a person who said they love her and then proved otherwise, so she may be gun shy to proclaim the words: "I love you too".
Go on your fun trip...see what happens. Of course, talking with her at a very calm time and asking her how she feels may be exactly what you need.
take care,
Codeblue