Right now the doctor was confused on what to do. She was torn between following through with her plans and helping Maria recover her memories and letting it stay like it was.
If she chose the latter choice then it meant she was siding with Fred to keep her memories locked up and keep her in a cage all her life. It meant she would be abusing her power as her doctor just to keep her safe from something that never existed in the first place!
If she chose the former option then she would risk breaking her down again. She believes that she's a killer deep down and if those memories and hurtful feelings resurfaced again then she feared how Maria would end up.
If she really wanted to help her recover her memories then she had to find a way to let her know what really happened to Damon and how that 'accident' she had always seen in her dreams wasn't her fault at all.
