Working with Marbas (while incarcerated)

Greetings and infernal blessings to all. I have a question. My wife and I are both going to be working with Marbas. I’ve read a ton on here about how to go about this on my end, but she is in prison and won’t be able to burn a sigil after the invocation. Can she take it outside and bury it perhaps, release her intentions to the spirit world that way?

You can summon a spirit with its “enn” ( sumoning chant).