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Using Yasmin pills for emergency contraception follows the Yuzpe regimen where oral contraceptive pills are used as ECP within 72 hours of last intercourse. As the first four pills have been taken by her after 30 hours of intercourse as per the regimen, so the next should be taken after 12 hours and should not be missed. The side effects can vary from mild nausea to vomiting, headache, bloating, belching, breast tenderness or even spotting. These effects are secondary to Progesterone and Estrogen in the pills.
These can be countered by taking an anti-emetic pill like Metoclopramide 10 mg, an hour before starting the regimen and also before the second dose after 12 hours. This shall prevent nausea and Progesterone side effects can be countered by increasing the water intake which can neutralize the Progesterone side effects. To help prevent you from feeling nauseous, one should take pills with food. It also helps if she would timer second dose such that she takes it just before bed. That way, she will sleep through nausea. The clotting is a known rare side effect of OC pills if OC pills are being used for years together for contraception, then predisposition for clotting increases.
But the regimen needs to be completed as per protocol to achieve the desired result. After taking the second dose, withdrawal bleeding should be expected in next 3 to 5 days and once bleeding is appreciated, it would indicate that there is endometrial shed and chances of pregnancy are minimal and she is likely to be pregnancy safe. The best would have been emergency contraceptive pills like an Ipill or Plan-B, but if it is banned in your country, Regimen is still a reliable means for emergency contraception with OC pills.