Is my 23-yr old daughter who started attending a college in UK from October 2018 considred a "full-time student"?

My 23-yr old daughter started attending U of Cambridge (UK) from October 2018 full-time and is expected to study there for two years.  My question is this: Is it correct she is not considered a "full-time student" since she was there only 3 months (October, November and December) in 2018? Also, does this mean she cannot be not considered our "dependent"?