Comments shouldn't exist either on the app. But it seems to be that the android versions have comments but no tips, which makes our life as contributors very difficult. If you're serious about learning Hebrew I recommend opening up the web browser of your phone and viewing the website version.
I don't see an explanation for this in the tips and notes, and I too an confused by the topic...
I wrote "the girl's sad" (with a contraption) and it marked it wrong. Have it fixed.
It should probably be alright. I suppose they want to make sure you understand it's a female child (=girl).
You think this could be relevant to the last exercise question for "the girl is tasty?"