Is it permissible to perform tayammum for prayer while on the way to Umrah if a menstruating woman becomes pure on the journey and it is difficult to perform ghusl? And should one pray with tayammum or with wudu alongside it? And should tayammum be performed for each prayer or for each incident of impurity? And is it permissible to perform Tarawih prayer in Mecca before Umrah and postpone Umrah?

If a menstruating woman purifies herself during travel, and there is ample time for the prayer, it is permissible for her to combine the two prayers while delaying the ghusl (ritual bath). However, if delaying is not possible, such as if she purifies herself near dawn or sunset, then she must perform ghusl. If she does not find water, or fears harm from its use due to severe cold or missing her travel companions, then it is permissible for her to perform tayammum (dry ablution). One should not be lenient with tayammum, as the original principle is to use water.

If the woman performs tayammum with a single intention for both menstruation and minor ritual impurity (hadath asghar), she does not need to perform wudu (ablution).

As for whether tayammum is for each prayer or for the impurity (hadath), there are two opinions: The first is that it lifts the impurity and is not invalidated by the expiry of the prayer time, but rather by the nullifiers of wudu. The second is that it permits the prayer and is invalidated by the expiry of the prayer time. The summary is that it is more cautious to perform tayammum for each prayer.

Upon reaching Makkah, it is permissible to perform the Tarawih prayer earlier and delay the 'Umrah to avoid crowds, while avoiding the prohibitions of ihram.