IC Property Taxes

Hi…I’m wondering if anyone could help me. My mom has been a resident of Iowa city for 70 years in the same house she grew up in. She lives on a fixed income of about $1800/mo. Her property taxes are almost $6000/year on a house with an assessed value of about $200k. Is this normal? It just seems excessive and she doesn’t have enough money at times. She does get a low income credit of like $200 off her property taxes. Is there anything or anyone I can reach out to with the city to see if there are more options for reduction or is this just what it is in Iowa?