I share your doubts. There is a time for weaning in mammals --- a time when a one-source, highly digestible/absorbable, tailor-made diet is no longer necessary. It comes sooner for some and later for others but your daughter has had a wonderful beginning. There's no reason to believe that a human child needs the baby milk of cows after weaning from breastmilk or formula. The formula your doctor is speaking of has milk proteins hydrolyzed, or broken down into smaller pieces that are no longer recognized as cow proteins. Either hydrolyzed cow's milk or purely amino acid based formulas are great for very difficult cases where there are no other nutritional options. Your daughter is plenty old however to be deriving all her nutrition from solid foods. If she's getting some good portions of vegetables and or beans and or nuts, she's getting great nutrition, I'm sure. The teas sound delightful and can help to reduce allergic reactions. A serving or two a day would be fine. If you're looking for a "dosage," then one tea-bag's worth of tea daily (all the tea one bag will make) is a good upper end, though not a strict limit.
Some of us still worry a little about our children obtaining optimal levels of all vitamins and minerals, once breastmilk is over. I don't feel it necessary but it's OK to try a child's multi-vitamin and mineral. Alternatively, as some little ones just won't do vitamins, some foods are fortified with what tend to be the nutrients of greater concern. It can be comforting to include a fortified food, for the few added nutrients, while generally nothing can beat whole-food veggies. A couple examples of fortified foods are some commercial cereals (you can still get whole grains) and the various milk alternative products. Enriched hazelnut or hemp milk have added A, D and E, B12, and calcium. Some foods have added C. Coconut milk is great stuff too. I don't recommend these be used as breastmilk/formula substitutes at all, but they can be used as occasional drinks or, even better, as bases for smoothies, with cabbage, a little raw beet, carrots, walnuts... all kinds of things work in the standard blender (just a delightfully bit chewy), along with frozen fruits (dark cherries are great) for flavor and great anti-oxidants.