Samuel, if you only have 30c then you may try crushing a 30c tablet (without touching it yourself) and dissolving it in water and alcohol as follows.
Take a clean 100ml bottle. fill it with 10ml vodka, 40ml of the purest water you have to hand. Tip the 30c powder into it and wait for it to dissolve. Then succuss the bottle ten times.
Give your mother a single dose which is done by taking a spoonful of the solution in the bottle, and putting it into a full glass of water, and giving her just a sip from that glass, discarding the rest.
Report back on the result.