Girl’s Mars is also in the 8th but for Dhanu Lagna this is not Kuja dosha. The girl has Pitru dosha due to Sun and Rahu combination in the 9th bhava (10th sign in the rasi chart).
Currently the girl is in Saturn’s dasa and Venus antara. Saturn in the 3rd Bhava and Venus in the 8th bhava is not a good recipe for happy relations. Saturn occupies the karmamsa (10th from natal Lagna) and Venus occupies rogamsa (6th from natal Lagna) in Navamsa.
The previous antara of Ketu was also not very conducive.
Though this antara is difficult, it is the next antara of Sun which can cause a breakup. Both should develop tolerance and Girl’s pitru dosha has to be remedied (if not done earlier) so that the marriage doesn’t break.