Asalam o alikum warahmatulahi wabarakatuhu.
I hold the opinion that this last saying is the best. It is permissible to combine prayers in case of need, but this should not be taken as a habit. This is also the opinion of Ibn Taymiyah, who said:
Ibn `Abbâs was not traveling nor was there any rain, but he mentioned this narration as justification for combining his prayers. He knew that there was no rain, but Ibn `Abbâs was involved in something important for the Muslims as he was teaching the people what they needed to know about their religion and he believed that if he stopped at that time and came down from the pulpit, the opportunity would be lost. He deemed that the activity he was engaged in permitted him to combine prayers as the Prophet (peace be upon him) combined prayers in Madinah without there being fear or rain but for some other necessity… All the hadîth indicate that he combined prayers to make things easy for his people. Therefore, combining prayers is permissible if otherwise there would be some hardship that Allah had lifted from His nation. Combining prayers due to debilitating illness is all the more permissible.
The same applies to the one who cannot maintain his purity for two prayers, like the woman whose bleeding continues past her menstrual cycle and the like. At the same time, we have a saying from `Umar b. al-Khattâb that combining of two prayers without an excuse is one the grievous sins." [Ibn Taymiyah, Majmû` al-Fatâwâ]
The saying of Ibn Taymiyyah on this issue is correct in my opinion. It is permissible to combine between prayers for a valid reason, but this should not be taken as a habit. Whoever combines prayers without a valid reason and continues to do on the basis of Ibn `Abbâs' hadîth has violated the Sunnah of our Prophet (peace be upon him) and gone against his guidance.
source:
http://www.islamtoday.com/showme2.cfm?cat_id=2&sub_cat_id=530
So yeh sis. insh Allah it is permissible.