Eman,
New Years day, 2000, I attended the funeral of a JW family friend who was one of the earliest "authority figures" in my life. The funeral was at a kingdom hall and the only speaker was an elder.
The decedent was a devout JW elder, who gave his life to the JW cause. He was an extremist in every sense of the word. The talk focused not on the decedent as an individual; rather, it focused on why we all must live like he did if we want "everlasting life."
I could have summed up the message in a much more concise manner than the speaker. If you want the hope of living forever with a bunch of Jehovahs Witnesses, you must slave away every minute of your present existence in service to a corporation based in New York. There was no talk whatsoever about any aspect of the decedent's life other than his witnessing activity. Nothing about family, hobbies, friendships, social activities, etc. Nothing but "you need to spend more time going from door to door so that you can have everlasting life like Brother X." It is shameful, to say the least, to use a funeral as a forum for delivering marketing messages and service commands to the faithful.
The JWs were very friendly with me and no direct comments were made to me regarding my departure from their faith (I guess that's because I was never DF'd or DA'd). It's so sad; many of these folks are wonderful people who are deceived by a cult but nevertheless zealously practicing what they believe to be right. I hope that some day the organization is weakened sufficiently to enable these folks to see the organization in its true light.
When the time comes, Eman, you can honor your mother's wishes and maintain your own self-respect by having the funeral at a neutral place (i.e. not in the kingdom hall), and inviting an elder to give the main talk. This way, you can control the content, by scheduling speakers such as yourself and any others you want to eulogize your mother, in addition to the Witness speech. I've been to a funeral that was done in this manner, and the elder who gave the talk stuck to a scriptural message rather than a "do more for us" message. It worked out well.