My answer do the best you can with what you have. However, she thinks any "najes" will invalidate prayer. Side note Tell her post-toilet urine excretion may be common. Read from here onwards http//free-minds.org/forum/index.php?topic=9605132.msg328810#msg328810 You can do a test with some cheap white undies and $10 UV light. She might be alarmed that vast majority of her prayers were not valid. ;D

Peace uq. I also observe salat in solitude. I have no choice either. I have not found a place where GOD Alone is served in Manchester England?. I am mindful of the following 9107 There are those who abuse the masjid by practicing idol worship, dividing the believers, and providing comfort to those who oppose God and His messenger. They solemnly swear "Our intentions are honorable!" God bears witness that they are liars. 9108 You shall never pray in such a masjid. A masjid that is established on the basis of righteousness from the first day is more worthy of your praying therein. In it, there are people who love to be purified. God loves those who purify themselves. 9109 Is one who establishes his building on the basis of reverencing God and to gain His approval better, or one who establishes his building on the brink of a crumbling cliff, that falls down with him into the fire of Hell? God does not guide the transgressing people. 9110 Such a building that they have established remains a source of doubt in their hearts, until their hearts are stilled. God is Omniscient, Most Wise. May be one day in the future, GOD willing? GOD bless you. Peace.