Why didn’t my friend congratulate me?

I have a friend group, 3 of us. We are all supportive to each other. I recently got an offer for an excellent job with a great salary and a much higher position at a new company. I texted the group and 2 of the girls congratulated me while the other one said nothing and actually changed the subject. One of the girls asked if I would still be going on vacation with her: I said yes. The girl who did not congratulate me started to post all these exotic vacations she wanted to go on: this person, who always wants to be validated for everything and always looking for support and gets the support really hurt my feelings and wondering is she really a true friend?

Why didn’t my friend congratulate me?
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