You could also light a candle in her honor, to show that you aren't ignoring her and are trying to reach her. I've written letters and burned them or buried them and it's worked, I just wouldn't write in harsh inks so if you bury them it won't hurt the Earth and if burned it won't have a harsh odor.
Doing research is always the best though, so you can know a little more about her personality.
Love, light, and blessings! )O(