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Hi Tree, I'm Brian and I can help with this!
AC systems ice for one of three reasons:
1) Low/no airflow across the cooling coil (evaporator)
2) Low refrigerant in the system
3) Operation in ambient temperatures below standard operation conditions without the means to adjust for them.
Now the first one, low air flow, can be caused by a MULTITUDE of issues. Duct problems, dirty evaporator coil, dirty air filter, dirty blower wheel or a failing blower motor or capacitor. The order I have above shows the issues in their most common order of cause.
Let me know if you want me to help you narrow this down. There are some simple steps we can perform to narrow down the issue.