refusing solids

My girl is over 7 month now and she used to be up for solids any time I gave her something! It got harder for the past 2 weeks, and today is day 3 when I can't feed her ANYTHING except boob... She closes her mouth, turns away and cry if I insist on taking some food... I tried giving her her favorite choices, but she doesn't care for them... I tried giving her every vegetable and fruit she tried before and she refuses to take it. Other than this she seems my regular baby, happy and smiley. Does anyone have an advise?