Approver Comments:
I think you've found her! Maria Frenkiel's name is an exact match in the database, and the birthdate makes her 17 years old at the time the album was signed, which is an appropriate age to have attended gymnasium.
For your future stage I research, if you can find an address, please add it to the comment field in the research workspace. Note here that Maria lived at Fischstrasse 17 4.
Since I think that the Maria Frenkiel you found is the one we're looking for, I'm marking this entry "Confirmed." I'm looking forward to seeing more of your research soon!