35.5inch Drain Clog Remover(1pcs), 25inch Drain Snake Hair Remover(6pcs) ＆ Cleaning Brush(2pcs), Hair Catcher Drain Auger Cleaner Tool Set For Toilet, Kitchen Sink, Bathroom Tub, Sewer, 9 Pack

https://www.amazon.com/dp/B0C3L7FKCQ?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_2&th=1 I found this kind of small flexible plunger quite useful for toilet, to break up the blockage, than a full size plunger.

I’m assuming you are young, cause my first thought was lock your bathroom door & only you have a key. This is probably not an option if you are young. If unclogging products have not worked, you need a snake drain (https://a.co/d/0cHKdxav) be warned what comes out will probably be disgusting & possibly things nightmares are made of. Once you have your drain unclogged, get a drain cover- there are different ones depending on your drain. If you can find one that fits in your drain & then put its normal cover over it would probably be best so your mom doesn’t remove it. Good luck 🍀