Parents are people too, so there are just some people who are not naturally inclined to be appreciative or show appreciation while there are others who do.
What I'd like to suggest though is one should not expect something that one has not yet give out so push it forward and make it flow. Put your heart in the following scripture:
Give, and it shall be given unto you; good measure, pressed down, and shaken together, and running over... For with the same measure that ye mete withal it shall be measured to you again -- Luke 6 verse 38.
In short, if you want some good lovin' better dish it out yourself-- Appreciate your mom until she appreciates you for appreciating her
I believe People can change and Love is the catalyst.