Times not moving

Question
Hi George
My daughter is 15 and has been swimming competitively for 6 years.  She peaked when she was 12.  She is predominantly a backstroker %26 freestyler.  I understand kids have growth spurts at this age and this is when they peak.  She has done marginal PB's.  She upped her training this year and changed her coach.  She does 9 sessions a week and a workout session.  Her problem is now she is adding on 4 plus seconds onto all her PB's.  We are astounded as she is the most hard working kid on the squad.  I took her to a Muscular Doctor and he suggested building up her deltoids with special exercises.  She has been doing this for a month or so.  I have also thought she is not getting enough recovery as she does Surf Life Saving on Sundays and competes at SLS.  
Any suggestions or help would be appreciated.

Answer
Claire--
You do have a pretty good point with the growth spurt, but there are also a lot of hormonal changes that happen in young women.  These changes can affect perfomance in any physical activity, her body uses a lot of energy for these changes.  Since your daughter has only been swimming for 6 years, she still has a long time left to return to previous form, if she peaked at 12(only 3 years in) she has some good swimming coming, don't panic.  Her body needs to adjust to it's changes(maturing), then she should start to come back.   
She has also added to her training regimen and changed coaches, she should be lifting weights 3 days a week to help with strength, but not just her deltoids.  Along with those she should be working abdominals, lower back, lats and traps for her core strength.  She should also work on arms(upper and lower)and legs.  Always train all sets of muscles, if you train triceps on back of arm(antagonist) train the biceps also(agonist), this works with all muscle groups.
Also, keep stressing proper technique in the pool, physical changes can change some technique a little and that could disrupt improvement, again don't panic she should come back.
Hope this helps,
George