Yes it's a good thing if she said aww in a cute or nice way! That means she liked it so yeah it's a good thing!
I grabbed her arm and said "Wait, I need to tell you something." She said "What?" It took me a good minute. And she said "Is this about relationships? Then I whisper into her ear, "I love you." She said "Awwww!" Is this a good thing or bad?