Dont let yourself fall into oh im just a beginner, she works with demons/deities, and has x years more experience trap. Fuck her.
Have you made/heard of a witches bottle yet? If you use the LBRP that littleshart suggested, you can make (and maybe ought to anyway) an easy and effective defense for the future.
First, pick a bottle you like - go to a thrift store or even the dollar store - find one you want to make your witches bottle.
I make mine in layers. I decide my elements, and then i ritualistically craft it, surrounding myself with the different layers. Be creative. I favor protective herbs like Rosemary, Angelica, Periwinkle, bay leaves, though im planning a new one with my deadly green children 


Anyway, i also i collect things like spiderwebs, broken shards of mirror, nails/pins, brew some herbs into a tea. I make the gathering the ingredients as part of the ritual - i smirk, hum and sway and collect them, knowing that whatever foe sends me something wicked is going to be fucking wrecked - keep that in mind always. For the plants, since i grow them, i touch them and talk to them about aiding me in my purpose, buuuut even without the living plants accessible, i think talking to the herb matter, flattering it is still an excellent way to get the buy-in of the plant spirit.
Anyway, create a circle. I ask the elements for aid - and call to them. lustral water, candles, incense, a bowl of earth, etc. I add the ingredients ive gathered one at a time - with my words i give them their purpose, and with my mind i create their function, and speak of what they will accomplish for me in the bottle, and what will happen to the one who sends some malefic work my way.
So for instance the spiderwebs: imagine a clear blue sky, and yet, something silky and thin glimmers on the wind - oh no! too late! its caught and snared - envision that “negative” force or horrid girl being consumed by a hungry spider or cut to ribbons by the threads themselves, as you add it to your bottle.
or the mirror pieces: as they drop, imagine them coating your skin, in waves washing over you, and you reflect back - return whats sent from whence it came.
or setting the bayleaves on fire as you drop them in - imagine a searing ring of burning flame surrounding you - hear the screams of your enemies burning alive, the negative forces burning up in ash and smoke, all while you calmly, and confidently, drop the burning leaves into the liquids within.
and do the same for whatever other ingredients you choose. you get the idea: be creative.make it yours.
i correspond mine to the elements, so i have different layers of the traditional: earth, fire, water, wind. also add pieces of you: fingernails, blood, hair, and/or piss. whatever suits you.
at the end of it, cork and seal with wax. i hang mine but some bury.