Hi Alicia, 

I've made a few small changes to help your letter seem more fluent and correct a few prepositions. Please also review the letter before sending it for missing spaces at the end of a sentence, or after a comma. 

Dear Committee members:
As an Assistant Professor of XXX at XXX University, it is my pleasure to lend my support for XXX to attend the XXX University to further her graduate studies in XXX.

I have known XXX as a resourceful and goal-oriented individual ever since she attended my XXX course (score: 90) in her first academic semester. She often raised thought-provoking questions during the course lectures and her critical thinking consistently appears in her written work and group discussions. In her fourth academic semester, she took my course of XXX(score: 85). The more I get to know her, the more I find she is dedicated to her field and works well independently. With her outstanding talent and solid background in linguistics,she also did quite well in her college students [this is redundant because we know she is a student at college] innovative practice project.I feel strongly that XXX’s unusual talents and abilities will stand her in good stead for a quality linguistics education, and your program will provide the best opportunities for her.

While at University, XXX had excellent performances performed excellently in most of her other courses, but she is more than a knowledgeable bookworm,she is an outstanding leader. She is not only the Commissary in charge of studies in her class, but also the project leader of their innovative project. She took part in and organized many extracurricular activities, such as “Cultural exchange activities between Chinese and foreign students”.She also devoted some time in to voluntary works. She has visited children with autism for several times,and often read audio books for to blind people.

We at XXXUniversity see an optimism, highly independence and passion in XXX, with highly unusual determination. Judging by what I know of her, I think XXX is fully qualified to pursue a Master’s degree in your program and she will continue to develop, both intellectually and professionally, as she prepares to become a scholar in her chosen field. Therefore，I recommend her to you without reservation. If you have any further questions with regard to her background or qualifications, please do not hesitate to contact me.

Sincerely yours