A <em><u>phrase</u></em> does not have <u>verbs</u>(action words) and <u>subject</u>(he/she/I...)
E.g. Amazing english books
A <em><u>Subordinate</u></em><em><u> </u></em><em><u>Clause</u></em> has verbs and subject but is <u>not</u><u> </u><u>a</u><u> </u><u>complete</u><u> </u><u>sentence</u><u>. </u>
E.g. If I love English
A <em><u>Independent</u></em><em><u> </u></em><em><u>Clause</u></em> can be a <u>complete</u><u> </u><u>sentence</u><u>. </u>
By telling her what she did wrong without balling her out is one way to do in other words she could look at her and say "Did u notice that you have a lot of grammar mistakes maybe you should try to find them and then I'll help you correct them." Does that help?