Is it possible that some combination of low rep, question-on-hold and use of an app could result in a situation where they might not be able to see a question delete option?
Android app does not support deletion of posts, even your own. See the feature request Allow us to vote to delete from the Android app
The user would have to open the question in their browser in order to delete it. Mobile version of the site does have the "delete" link under posts.