My hair won’t curl😭😭

black beauty🖤

I know this is a bit irrelevant but my hair type is 4a/b and My mum straightened my hair for the first time in three years in April and Four months later recently She did it again I kept it for about a week and I washed my hair today but the ends aren’t curling anymore the ends are straight and I’m really worried that I’ve damaged my hair I’m 15 btw and all this time I’ve been rlly trying w my hair being patient taking care of it as well but I feel like all the hard work was for nothing now idk what to do I tried deep conditioner but it’s not working and I really don’t wanna cut it because I’m insecure about the length of my hair as it is😭😭🤦🏾‍♀️🤦🏾‍♀️🤦🏾‍♀️