Why don't you try a self empowerment spell? Something that will give you the courage to ask her?
You can use olive oil with cloves steeped in overnight (then drained) instead of the clove oil (which isn't good anyway because clove essential oil can burn sensitive skin).
This spell seems fast enough that a red birthday candle will work, but if not, I suggest having a few on hand and if one gets low, light a new one with the same flame and keep going.
You can find dragon's blood incense anywhere, I've even seen it in dollar stores. And if your parents don't like incense in the house, you can burn it outside or maybe a friend's house?
My own style for courage would be a medicine bag.
Most red gemstones give courage.
Thyme is good for courage. But if you make a sachet to carry, I would also add an herb of success like cinnamon or ginger.
Since you're still in the broom closet, this website may help
It gives all herbs that can be easily found in a kitchen and easy ways to release their energy through the elements.
Sometimes simplicity is the best. ;-)