I think it's not totally her decision, since it will take efforts by several family members to make the trip smooth for your mum. But I think every effort should be made to include her, and the family recruited to make it as seamless as possible for her.
We travelled with elderly MIL to family events (weddings and reunions) by both car and plane several times. She was using a walker at the time, but could not walk long distances, so we rented a wheelchair at the destination for ease.
You do not say how mobile she is, or what her personal care needs are. If she is in a walker/wheelchair, plan a break in the drive at a location where there is a wheelchair friendly restroom. They are often advertised, and most restaurants these days are wheelchair friendly. Same with a hotel near the event. Can you find a hotel with a suite; as in two separate bedrooms, so you or a family member can share? We did this with MIL. At the event, she will most likely have a lot of fun and not want to leave early, but if she does, arrange so someone can take her back to her room early if need be.
I wouldn't be worried about exhausting her energy. If anything, having something planned will give her a lift, something to look forward to, give her a chance to see people she hasn't seem for a while, and create fond memories for her.
Take lots of photos and make a little photo book of the event so she can look back on it, since there may be a lot to take in at the time.
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