I guess she had nothing to do with it either?
No, she didn’t.
So called “glasnost’” and “perestroika” were planned before Reagan or Thatcher even took office.
Gorbachev was handpicked by Andropov to succeed him (Andropov died too early to have consolidated his forces to appoint Gorbachev).
You can google until the cows come home. I have a graduate degree in Soviet studies. I lived in the USSR during parts of those times, the spouse of a Soviet citizen. I learned how to read Soviet papers to discern the truth. I have family members who spent time in Soviet gulags. My FIL was a dissident, jailed for over 15 years. One thing I know well, learned from a spouse who was taught well by my FIL, is how communists think.
The external world had little influence on Soviet mentality, other than to buttress the view that “we are about to be attacked”. There were far more pressing domestic issues to deal with which drove Soviet policy than anything emanating from the West.