Angel and Minnie, became almost inseparable. More like sisters than Aunt and niece. Angels accidental magic was strong, It was happening more and more, much more than was normally expected. One afternoon she found an old wand of one of the Potter ancestors in a drawer. The resulting explosion knocked out the back wall of the house. No one was hurt, but it did finally get the family to decide to angel checked. Her levels of magic were almost as high as an adult witch, It was thought she would eventually become extremely powerful.
The problem being how to help her gain control until she would go to Hogwarts. Of course Hermione was the one that was the biggest help. She went into total study mode, examining every tome she could find to come up with an answer. She came to Harry with a special material to absorb her magical energy until she could be taught to control it.
It solved the problem for the time being. It still bothered Lilly the most, her daughter could be at risk. Though nothing had happened and they loved each other dearly, She knew sibling rivalries could occur.
One afternoon Such a problem arose. The girls were playing in the back yard with a child's snitch. It was flying around and Minnie caught it. Angel yelled "NO MINE" The little snitch turned red hot in her hand and burned Minnie severely. Minnie Was Screaming And crying The toy had burned her so badly she couldn't let go of it. Both Lilly and Ginny came running. Lilly Picked up Minnie and instantly disappeared. Lilly Reappeared at St Mungos just seconds latter. Her daughters hand still smoking. She ran to the cursed objects ward as fast as she could. The healers immediately went to work as Lilly stood in tears. A healer and an auror, came out soon after to talk to her. Asking what happened and who might be responsible For such Dark Magic. Lilly explained what happened and was asking what was happening to her little girl. The healer told her. "Your Daughter Has extreme curse burns, Mrs Potter, We will have her here for awhile. I've never heard of a child of nineteen months doing anything like this before, Could you bring in the other child to be examined again. We will need to find her magical signature To do our best to remove the magic that caused it."
Lilly flooed Ginny and told her to bring Angel right away/ the Healers needed to see her! .