What are the chances of a girl who has HPV spreading it to her partner if you use a condom?

Condoms not as. Useful for hpv. Due to the common occurrence of hpv lesions on the vulva, condoms are not nearly as protective for hpv as for most other stds.
Less, but not zero. Vulvar warts may still contact skin beyond the reach of the condom, such as scrotal skin.