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No I would not expect any antibiotic to cause such effects ...
A UTI especially a severe one such as infection of kidney (pyelonephritis) may cause confusion but this due to the infection is not permanent but improves with correction of the infection and correction often if associated dehydration
Her having a sudden drop in ability neurologically sounds to me more that she may have had a baseline of Alzheimer's with very possibly a syper-imposed stroke
I would advise more extensive follow up with neurologist >> MIR of brain and other tests to look for potential problems which can cause neurological findings (B12 deficiency , thyroid disease , other metabolic disorders )
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Anthony Bray MD