You can write..
--She helps me in alot of things
--She understands me very well
--She is very graceful
--She does many things for me
--No one knows me so well
--She can do anything for me
--The sweetest mom in the world
--Even if i do any mistake she forgives me
--She is my teacher
--She teaches me values that would help me to be a good adult in future.....etc

You can exaggerate these points.
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The most loving and caring person  ,  she understands my problems , no one me better than her , some say that gods can't be every where  so he sent mom , if smthng bad happens to me her day goes bad ,the best mom in the world ,she always care for our better future,  can't bare my pain , try's to fulfill whatever i wish