Is there an injection that will bring a bitch into season early?

Not that I am aware of, I wouldn't want to mess with the bitches normal cycle for fear of cocking it up for the future.

Not that I am aware of.  But I believe there are a couple which can be used to delay it.  However, I don't think either are advised if you ever plan to breed from the bitch.

I do want to breed from her but am waiting for hip operation and wouldnt be able to cope with litter and unable to get about easily.
If she came into season within the next month it would be ideal but she isnt due until September :(
Never mind!!

Galostop can be used to bring bitches into fertile oestrus, the closer the bitch is to her normal oestrus the quicker she responds to treatment http://www.vet.chula.ac.th/~tjvm/full_text/v41/413/pdf/41supplPDF/09%20TJVM_Review.pdf

http://www.lowchensaustralia.com/breeding/induction.htm

Cheers :)