For only 30 days you did quite well on your own. One thing I noticed is your left hand/wrist. Try to play with your wrist a bit straighter, almost a straight line from your forearm through your hand, rather than your hand being bent backwards at the wrist. That way your knuckles will be up and your hand high, and using the “base knuckle” (where your finger meets the hand) to place your finger on the string. Think about “carpal tunnel syndrome”. It may take you a little out of tune until you get used to that.
Keep it up! Well done! Now, go tell your sister what I said and give ‘er the raspberry!
Do you have a music stand? Was that memorized?