How much tutoring is enough

Today, a young lady, who was not reading when we begin tutoring two years ago, returned to tutoring.  Compared to where she was when we began two years ago she reads well.  Mom and I are ready for her to fly educationally.  She will be in the 4th grade next year.  She has an IEP. This is an individual education plan written to help her succeed. However, when she was given a test, the IEP was not used.  She was recommended for summer school to support her learning for next year.
Mom decided to tutor here instead of  summer school.  She has not retained her balance ability as well as I would have thought.  She quickly picked up the balance and tutoring should help.  I will increase the balametrics portion of tutoring. Also, I will modify the go fish word game so she will recognize the words more independently.  Instead of showing her the word as I call it, I will call the word and have her spell the word.  I was surprised how well she can do this. When she gets stuck, I give her the vowel spelling.  An example of this is the ea sound as in eagle.  We will also work more on making sentences with the words to help with understanding the different meanings of each word.
We will only work for one day a week for 6 weeks to see if this is enough support.  If not hopefully, we will work one day a week when school starts to give her the support she needs.  Some students just need more support to maintain their ability to learn efficiently.  People of all ages just have different learning needs and often our society wants everyone to learn like everyone else. When the student does not learn the way the school or teacher wants to teach, the student is blamed instead of the method of teaching.