Although my library is far from the best, I have looked at what little I have. The Transvaal Rebellion by John Laband is the only one I have on this war that mentions the unit and it is only once. It is in the context of the period just after the armistice when Wood is mentioned as having a buildup of units that have finally arrived from Britain. The 7th is mentioned as part of the Natal Field Force and he states that "the 7th (The Queen's Own) Regiment of Hussars and the 41st and 85th regiments were encamped at Pinetown in the healthy hills northwest of Durban." Woods notes that the regiments which had served in India clung together and treated the others as "griffins", or new boys.
The other reference I have, a copy of "The British Army" , by E.C. Talbot-Booth (no date of publication but later than WWI and before WWII), does not list any battle honors for the 7th between Lucknow and South Africa 1901-1902.
Sorry, not much there.