I agree with Konman, your mum sounds as if she handled it pretty well

Im still a teen and live at home with my parents too. Unfortunately Ive got a few more years before I can be legal and think for myself...
When I first came out to my mum and dad, they had a short chat with me and left it at that. They never bring it up, never ever

I had to fake sick to stay home alone one day. During that day I rode my bike down to the hairdresser. It was a much further ride than I thought!

I got my hair cut, came back home...and arrived just before my grandma unexpectedly happened to turn up with lunch. When my parents eventually came home, they were so angry

They said things that upset me, blamed the internet, and didnt wanna believe it. I was reminded day after day for weeks on end about "how I had lost all their trust".
When they got over that "huge" incident, I asked them for a binder. I explained what it did, and my dad straight out said NO. He went on to add to that, saying "You have a good body! You dont want to hide it with things that will ruin the way you will grow"

I eventually bought a binder without my parents ever finding out. As for the packer, I never asked for that one! I managed to buy one with some help from an awesome dude from this very site, and again my mum and dad knew nothing

At home, my parents call me by my birth name, and use female pronouns. Its much the same story when we go out and about...which is super embarrassing

Especially when I get called "he" by some lovely shop assistant for example, and my parents loudly "correct" them with a SHE/HER!

I have told my mum more than once, that I dont want to be called "she"...but the best answer she could give me then and there was "getting called she, is better than getting called it"
The only thing my mum and dad do for me towards trans regarding stuff, is pay for me to see a psychologist. And to think they actually tell him "how supportive they are of me, and how they want the best"
So, I use my psychologist to bring up such topics, especially testosterone...cause he is the only guy they seem to take seriously.