Hi David,
I hadn't previously implemented a parser for the odds ratio section, but it's long been on the to-do list. I recently added this to the package, though it's only available in the development version. You can use readModels(), then find the odds ratios in obj$parameters$odds and the confidence intervals in obj$parameters$ci.odds.
To install the development version, use:
#install.packages("devtools") # if needed
library(devtools)
install_github("michaelhallquist/MplusAutomation")
Hope this helps,
Michael