Don't fully understand. Sorry, your mum has injected her epi pen ? I thought they were just a one-time use in the thigh for anaphylaxis or extreme allergic reactions to bee stings or peanuts etc ? Apologies if I'm reading this wrong. If you mean she's taken twice the amount of insulin ? Depending how much extra, she should keep testing to ensure she doesn't get too low. She can eat extra carbs or a fruit juice or something to mop up the extra insulin ? Is she on her own ?