:salam2:
I've been looking at you situation for awhile but never commented (a rarely comment on anything anyway). I just wanted to throw out there that there are ways you can make your salaah without her even knowing.
OK these salaah are for the sick or unable, but in your situation I think you can do it in order to make Dhuhr, Asr, and Maghrib.
You can make salah sitting down, and just make the motions of salaah sitting down (but I think your mother would know what your doing so this one is no good for you)
You can make it lying down of course facing qiblah on your bed (do this with the motions and signs of salaah).
The Prophet of Allah (S.A.W) said, "Perform Salaah by standing, if you do not have the strength then perform it sitting down. If you do not even have the strength for that, then perform it lying down with signs and gestures."
I know this is for illness and sickness, but in your situation when you can not make salaah and your mother is home, I guess you can make it lying down.
If I am wrong please forgive me, but this is the only way I can see that may help and you, and a way that you can still make salaah.
Insha'Allah may Allah make it easy for you soon. Ameen
:salam2: