What is the ruling on the prayer of a female student who attends classes, and the call to prayer (Dhuhr, Asr, and Maghrib) is made while she is walking in the street, and there are no nearby prayer areas or enclosed spaces for prayer without the presence of men? And is her prayer not accepted if she combines the three prayers?

Prayer is the pillar of faith, and delaying it past its prescribed time is a grave sin, which some scholars consider to be akin to disbelief. It is not permissible to delay the Dhuhr and Asr prayers until the time of Maghrib; rather, every prayer must be performed at its appointed time. The Dhuhr and Asr prayers can be combined, either by advancing the latter or delaying the former, when there is a need to do so.