Your dietician is likely recommending the flax meal for its high fiber and protein content, in addition to its healthy fat content. She's probably recommending the oil for a concentrated dose of omega-3s (not realizing that the omega-3s provided by flax are short chain, and thus converted at a very low rate ((1-5%)) to the long-chain omega-3s usuable by the human body).
A tablespoon of flax meal is very much on the low side. Eat it like any oatmeal-type product or mix it in with shakes at about 20%. Flax meal will contain ~50% fat, ~30% carbs, ~20% protein.
I'd go 3 or 4 tablespoons of oil at least if I was supplementing with the oil. (and this would still lead to a conversion rate far below that of what a lot of doctors are recommending as beneficial) (you basically get about 25 mgs - 125 mgs of long-chain omega-3s per 2.5 grams of short-chain omega-3s (what you see on the label) in flax oil; many advocate a minimum dosage of 2.5 grams of useable (long-chain) omega-3s each day.
Flax meal has some value as a protein and fiber source (and if added to shakes helps to slow down digestion).
Fish oil is a better choice for omega-3s as its omega-3 content is long-chain.