Holiday pay/ Bank Holiday pay

So to put this as generically as possible. I work at a small business. There were originally more staff but over the last while it has whittled down to just 2, myself and my employer. I like my job and don't really have a complaint on that side of things, I pick and choose my hours for the most part which is great. I'm there a while now (about 18 months) and I've never received holiday pay or bank holiday pay. I know its a reduced rate because I'm part time but I'm afraid to rock the boat by even asking about it because she gets a bit huffy when I bring stuff like this up. Ive noticed when I ask about future staffing she automatically gets her back up, anyone I've suggested for the job she never follows up so we don't even have the staff to cover if I did ask to take some time off. Can anyone tell me what to do, my family are starting to get mad that I'm not asking for it, is there a required amount of notice I need to give etc when applying for holidays?

Side note I do get a Christmas bonus from her and I'm not sure if im supposed to accept that as part of my holiday entitlements or not?

We've been friends longer than I have worked for her but it's getting a bit unbearable now and I don't want to ruin our friendship over something so silly as work drama so any kind words of wisdom would be great.