You can also press them between heavy books. This can be tricky, though. Putting them between sheets of newspaper is a good idea and make sure they stay dry. I've had mixed results. Some flowers have pressed and dried beautifully, others have molded and made a mess. I've done roses, carnations, daisies, etc. If you google "dried flowers" or "pressed flowers" you'd probably come up with some good instructions as well as some display ideas for after they've dried.
I'm so sorry for your loss. I think of my Grandmother nearly every day. I like to think she's nearer me now that it isn't miles that are between us.