Is it okay to decline a babysitting job if the child has special needs that can cause issues for me?

Hello! I (15F) am starting to babysit I just had to decline a job because she said her daughter is nonverbal + aggressinve and is prone to insomnia. It was meant to be sunday 6-11pm. I don't feel comfortable babysitting a child who doesnt sleep well, let alone if they have issues with aggression. The mum is ridiculing me saying I'm "abelist". I will babysit a child with special needs but i have autism, and a joint disorder i cannot be up and down and dealing with agressive behaviour from a toddler. Am i in the wrong or is it okay for me to decline this? Bear in mind i asked her if her daughter had special needs and she said no. she then messaged me a day in advance saying she "forgot to tell me".

edit I have blocked her. also just to clear things up I have 1 1/2 years of experience in childcare since I was just over 13 I have volunteered in a toddler playgroup, once I turned 14 I got a part time job as a nursery assistant on college placement, now I've obviously just started babysitting but I very much am experienced I'm 3 months into a 10 month SEN care college course