I would guess up to about $250 probably
The best way would be to go and try these yourself but here are some ideas to take with you in any case. If you can convince your mum not to worry about price, go into the myer in the city, go to the mecca cosmetics section near the fragrance and ask to speak to clint. he is one of the only males i've seen there, super tall with quiff hair.
He is AMAZING with perfume and totally non-imposing so if you tell him what you want, your price range and what you currently wear he should be able to recommend something for you even if it's not from the niche fragrances they sell there.
Sarah Jessica Parker - Covet
notes: geranium, lemon, chocolate, lavender, honeysuckle, musk, amber.
it's one of the only celebrity fragrances that I have ever liked. The chocolate is rather strong in it, (I know you mentioned you liked foodie fragrances) but all in all it's rather green and fresh.
Armani Code for Women
notes: orange, jasmine, vanilla, honey
I absolutely love this fragrance but I have never bought it because strong vanilla afterscent often gives me a headache. It's spicy but sweet, and the vanilla is very long lasting. It's written up to be oranegy but on my skin I have never noticed that.
Chanel Chance Eau Fraiche
notes: citron, hyacinth, jasmine, musk, vetiver, amber
I have always thought that the lingering smell this leaves on me is so vanillary but vanilla isn't listed as one of its main notes. It's incredibly fresh so you may not like it as much as other soft florals, but I enjoy it's very subtle fruitiness.
Serge Lutens Feminite du Bois
notes: cedarwood, orange blossom, rose, violet, honey, plum, beeswax, clove, cardamom and cinnamon
Probably my top recommendation for what you are after. I adore this fragrance. It's classed as an oriental floral and it's just gorgeously delicate. It was originally launched for shiseido but then serge lutens released it under his own name using exactly the same ingredients but adjusting the quantities of each. They sell this in the Mecca in Myer in the city but I can't remember for how much. From memory 50ml was <$200 but you will have to double check.
Diptyque L'eau de Tarocco
notes: orange, grapefruit, saffron, cinnamon, rose, ginger, cedar, incense, musk
I wear this regularly at the moment on hot summer days. It's definitely one of my all time favourites and smells pretty much exactly like blood oranges for the first half an hour until it softens into this lovely soft spice/floral combination. It may be tricky to buy, internets ahoy!