If you have the newest version, it should work... Did you use detect magic first? Erica won't really use Dispel if she doesn't notice there is magic at play first. If this doesn't work, maybe share your save with me, and I can try to dig deeper.
Thanks for responses. When i play again I will try again and if I still cant then will reach out. Going to replay this after I finish to see other paths. The only thing I did differently than normal was get dispel before joining a guild and tried to enter.