Hello,
Thank you for your query at DoctorSpring.com
DO not worry, there is no side effect.
Just make sure she does not mix up her suppositories in future.
As such, taking Voltaren ( Diclofenac ) suppositories accidentally , once in a rare while, is alright, and there is no complication imminent to her or the baby.
All the best
Please feel free to discuss further.
Regards.