theonlyone,
I personally think you know your cat better than anyone and as long as you know that that lucky is not in any pain and she is doing well then stick with it, My dad died of cancer and my best friend has a very bad case of breast cancer she had loads of nasty chemo for around six months and they told her that she would feel so bad and not be able to get out of bed, suprisingly the chemo never made her feel bad at all ( just tired) ,
Everyone should try options open to them as the affects are not the same for everyone, I wish you all the best of luck with Lucky and hopefully it will work,( Chemo does make you have a soar/dry throat so that may be why she is not very vocal)
jo