Wa alaykum assalam wa rahmatullah wa barakatuh

 

In the Name of Allah, the All-Merciful, the Mercy-Giving

 

All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.

 

Shortening prayers is allowable only while travelling. So, if you travel for this firing practice, you may shorten four-rak`ah prayers to two-rak`ahs. But if you do not travel for this practice, you may not shorten prayers.

 

However, in a situation like yours, you may combine Zhuhr and Asr prayers either at the time of the former or the time of the latter and may also combine Maghrib and Isha either at the time of the former or the time of the latter.

 

This should give you a wide range of time and allow you to defer prayer until you find a suitable time and place. If there is no chance to stand up, you may perform prayer while sitting down.

Finally, let me advise you, sister, to find another job that is more suitable for you.

 

Almighty Allah knows best.