I think the advice now is to introduce as many foods as you can from a younger age rather than avoid them altogether. You could be cautious with the known allergies but people have different allergies to different things so one member of the family having an allergy to one food doesn't mean that your LO will have the same allergy, it could be a totally different one.
if you already know LO is has a reaction to milk (if you are on a limited diet for BF or have a special formula) then I'd hold off on anything with dairy in.
There are lots of allergies from my side of the family but my DS doesn't have any allergies, he did however vomit every time he ate rice (baby rice, rice pudding, rice, rice cake) so we quickly abandoned rice.
I personally feel Tracy would have updated her weaning guidance based on more resent research if she was still with us and able to do so. The general guides now are to either the traditional route to introduce puree at 6 months shortly followed by finger foods along side the purees (after just a few weeks), then quite quickly moving from puree to mashed and lumps alongside finger foods. Or to go the BLW route which does away with purees and goes straight for finger foods, foods are served closer to the way the family eat them in family meals.
As BB said I would avoid salt all together, LOs daily intake allowance for salt is very very low, don't use any in cooking and avoid seasoning which are high salt (soy sauce, stock cubes).
Little girls should have no more than 2 portions of oily fish per week - again this is not an allergy guidance it is a regular guidance. More portions of fish can be served so long as they are not oily fish.