Kent Girl’s Bicycle

I bought this bicycle for my daughter about 5 years ago.  I tried to start a routine with her, riding bikes.  She was not at all interested and only rode it a few times.  It has been hanging in the garage ever since.  The tires are currently flat and I have not aired them up.  So, I don't know if they lost air just from sitting or if the inner tubes need to be replaced.  If I remember correctly, this bike cost about $135 when I bought it.