Hi Carole,
Oh, plenty!
First, "the indicated remedy"

on basis of the entire case, should
have a normalizing effect on blood pressure, whether too high *or* too
low.
But additionally, low blood pressure means that either there's a pretty
significant dietary imbalance with respect to electrolytes (e.g.
insufficient dietary salt to account for losses during exercise?), or
(*much* more commonly) that the adrenal glands are struggling. So if
the diet is reasonably normal (or high) with regard to salt intake, the
blood pressure might be helped anything that supports adrenal function
and/or "stress" resistance in general, and/or supports healthy blood
sugar levels.
So, e.g.: small, regular meals; regular and sufficient protein (as
well as veggies), low glycemic, no refined carbs; and/or herbs that
are adaptogenic or alterative, and/or known to support adrenal function
(and thyroid too). (All of this should help *either* high or low blood
pressure, BTW.)
Not a very specific answer...
Going for that totality-based chronic remedy could well make all of the
above completely unnecessary anyway! Still, I figure it's good to have
choices.
Best wishes,
Shannon