Worried about low energy DD18, any ideas appreciated

[vivvi]

Hi all, thanks for taking the time to read this. At a bit of a loss with my DD18. Briefly, she eats very healthily (lots of protein), sleeps well, periods not too heavy, does a sport, all fine with school/friends. Been to GP recently (though not about this) and did full bloods etc, all fine. On contraceptive patch, omega 3 and vit d if that is relevant! Underweight on BMI chart but looks slim not skinny.
Last year she was in a small but upsetting car accident and seemed to have a traumatic reaction to this (hypo reaction - so went very flat, passive, tired, low mood) but she seemed to generally emotionally recover within about 3 months. Around this time she lost a lot of weight (10kg), which she did not regain.
My issue is this: she says herself she feels very low energy (e.g. at her sport feels like her legs are heavy), she does not have much energy physically. Also is still a bit flat emotionally (not excited about Uni in future, upcoming fun events etc.) which friends have noticed and expressed to her.
She is a lovely girl, great company.
As she has low physical energy and a bit flat emotionally, what should I do? Is it diet? Need supplements (I'm a bit cynical about these). Counselling due to the accident?

I would say contraceptive patch, was she better off it?

Both omega 3 and vitamin b12 make me sleepy , tired and flat so may be she has the same issues as well. If her blood works are normal then stop 1 supplement for few days and see the effects and then another if that does not work.
It could also be the patch as pp suggested but don't eliminate everything in one go.
If after elimination you find that neither supplement nor patch is the problem then look at her diet, she might have a food intolerance.

Could it be depression?

Thanks so much for the replies, a good few ideas I had not thought of. I kind of can't figure out if it is physical or emotional - both effect the other one of course. She has just started the last year of secondary school, so that it stressful for her. Am unsure if I should go to a GP or a counselling service, I guess GP as the first port of call. I really appreciate your thoughts @Dangermouse80 , @Worriedmrs and @TeenDivided .

Has she had glandular fever? Or covid, come to that.

I have depression and some of her symptoms sound very much how I get. I feel as though I'm wading through treacle when it hits hard, I also get the feeling of feeling flat, the not feeling excited about University are also symptoms of depression. Good news is that if her doctor is understanding then starting a course of antidepressants is the way to go. I take them, they really make a difference.

She needs to eat some carbs, especially for sport, and she imo needs to regain some if not all of the 10kgs she lost if she's now underweight. No need for supplements if she's getting all her vitamins through her diet. I would look for a decent nutritionist and possibly some counselling.

And waiting lists for CAMHS are pretty long so you maybe need to go private.

CAHMS is for children, her daughter is 18 she comes under adult health now.

Hi all, I just wanted to let you know the outcome of this - we went back to the GP, and he ordered more detailed bloods. It showed up that she has glandular fever (great catch @Surtsey ) in the last few months (neither of us recall her being unwell) and her low energy is down to this. TBH I was very glad that there was a physical and not emotional cause. And this information does seem to account for her symptoms. So basically all she can do is (try to) rest and take probiotics.
He also has low blood pressure (somehow connected to the weight loss, not entirely clear about this). He said she is slightly underweight but he is not overly concerned about this. Back in a months for bloods/ecg (not sure why), and blood pressure check.
So thanks all for your comments and suggestions. I am trying to pump good food into her and trying not to worry that she might be one of those people where the tiredness lasts for ages.

Glad you found out what was causing it & that it's nothing too sinister. 🤞she makes a good recovery - I'm sure she will with you looking after her!

@vivvi Glad you got to the bottom of it, and I hope she is soon feeling very much better.

Bit late, and the OP has solved the issue, but my DD had massive Vit D deficiency and as soon as that was remedied she perked up. Just in case anyone else is reading.