All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His Slave and Messenger.
Usually, a mother is kind and compassionate toward her children in general and her daughters in particular. So, if the case is as you depicted with regard to your mother and her attitude towards you, then it is quite unusual and you should look into the matter and probe the real reasons behind such an attitude in order to find the apt solutions for each reason. If you had done something wrong, you could get things right and apologize to her; and if there is a misunderstanding, you could explain your situation and point of view.
Perhaps the matter is nothing more than mere jealousy or the like. In this case, it is better if you avoid all that might trigger her jealousy like talking to your father in her presence or telling her that he gave you such and such as a gift and the like.
However, you should never forget that she is your mother; you are commanded to be dutiful towards her and treat her kindly regardless of her bad attitude toward you. Please, refer to Fatwa 87019. Also, we advise you to observe patience; verily, patience brings about nothing but good results, Allaah Willing. Please, also refer to Fatwa 83577.
Our second piece of advice to you is to supplicate Allaah, The Exalted, to rectify the affairs of your mother and bless her with guidance so that she goes back to her senses. Supplication is the most effective means by help of which a Muslim can accomplish what he aspires to and ward off all that he fears. Allaah, The Exalted, commands us to turn to Him in supplication and promises to answer our supplication; He says (what means): {And your Lord says, "Call upon Me; I will respond to you." Indeed, those who disdain My worship will enter Hell [rendered] contemptible.}[Quran 40:60]
There is no harm in avoiding being in the same place with your mother so as to evade potential problems that might be incurred by being with her in the same place. It is better to do this in an indirect manner so as not to provoke her and bring about the exact opposite results. If your mother happens to backbite others and the like in your presence, you should gently and politely forbid her from doing so. When a person forbids his parents from doing an evil act, it is not considered undutifulness towards them; instead, he is adhering to the obligation of enjoining good and forbidding evil. Abu Sa‘eed reported that the Prophet said: "Whoever of you sees an evil, let him change it with his hand; and if he is not able to do so, then with his tongue; and if he is not able to do so, then with his heart — and that is the weakest (manifestation) of faith." [Muslim] This obligation is general for every Muslim who witnesses a sin being committed. For further information, please refer to Fatwa 90264.
We implore Allaah, The Exalted, to bless your mother with guidance and success, and help to attain goodness and to protect her from the evils of her own self and her sins; verily, Allaah, The Exalted, is The All-Hearing and He answers the supplications of His slaves.
Allaah Knows best.