SPRINGFIELD — Growing up, JoAnne Guthrie-Gard’s daughter Erin had up to 20 seizures a day. It took Guthrie-Gard nearly four years to find a medication that finally helped Erin live a normal life.But four months into taking the drug that was covered by the far northwest suburban Streamwood family’s insurance, the provider said they would have to pay for it out-of-pocket.A three-month prescription was $10,000 — an amount the high school girl’s family couldn’t afford.“It’s …