Roll Over Beethoven

Astrid was playing on her activity mat this morning when Uwe exclaimed, "Look! Look! She's rolling over." My initial reaction was, "I know, she's done that before" because Astrid has been able to roll over onto both sides for sometime now. But I looked again and lo and behold Astrid had completely rolled over onto her stomach. Uwe and I were not expecting her to be able to do that so young, so we were completely shocked. She did it again a short time later and this time Uwe asked me not to pick her up, so we could see if she could get her one pinned arm out from under her. Can you believe she did?! Uwe said his niece wasn't able to do that until she was 8 months old. It's amazing. We're seeing our daughter grow up right before our eyes. And all this from a baby who hated tummy time. As soon as she got her pinned arm out from under her she was holding her head up and pushing up with both arms. Does this mean she'll be crawling soon?