Is you mom planning to learn to ride on this pony? I'd be slightly concerned about a novice rider getting on such a young pony as the pony could pick up some bad habits. Just my own opinion.
If you are looking for something that you can all enjoy, personally I would recomend something with a few more miles and years behind it. A novice rider on a young horse could lead to serious problems very quickly.
Stop for a minute, open your mind, learn. You may not agree with what I say, I may not agree with what you say but we will both learn something new.