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. We ask Allaah to exalt his mention as well as that of his family and all his companions.
The mother has a great right over her children, she bore them in her womb and was exhausted bringing them up and spent sleepless nights because of them. That's why the Prophet emphasised her status when he was asked about who deserves one's good company and he said: "Your mother". Then the man asked again: "Then, who?” The Prophet replied: "Then your mother". The man furthermore asked: "Then, who?” He replied: "Then your mother". The man again said: "And then who?” He replied: "Then your father." [Al-Bukhari and Muslim] Therefore, we advise you to be kind to your mother and obey her within what is permissible, i.e. in things that are not a disobedience to Allaah and that do not cause harm to you or a burden that you could not bear. So you have to obey your mother regarding your female friends; it might be that she is more knowledgeable about them than you, especially since you mentioned that she is seeking your benefit. You have to try to convince her to allow you to befriend those whom you know to be religious and have good moral character. There is no harm in seeking the help of her relatives and others in order to convince her. If she agrees, all perfect praise be to Allaah. If not, you have to obey her, as we have previously stated, provided that this does not cause harm to you or a burden that you could not bear, because in such a case you are not required to obey her as obedience is within what is permissible.
Allaah Knows best.