My girlfriend is not at all needy or I doubt lose that spark in the relationship. How can I test or what can I do?

2.5 years relationship. What made me say that is..

1. She lives in a women's hostel. She's mostly busy with college and friends and put very little effort to find time to talk.

2. When at home during holidays, she mostly spend time by chatting with the same friends (females) at college. And when i talk about this, she just ignores it playfully.

I know that she love me. But doubt if the freshness has lost. how to know if she really lose that excitement?

My girlfriend is not at all needy or I doubt lose that spark in the relationship. How can I test or what can I do?
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