How to tell boss I'm leaving? (small close-knit team)

[suntancreamandicecream]

Just that really.
Tomorrow I need to tell my boss that I'll be leaving (need to do it quite early in the morning) as I think the reference request mind land in her inbox tomorrow.
It's a small, close knit team (only 5 of us) and all have a good relationship. She has invested a lot of time training me and helping me develop in the role so I feel so terrible about telling her I'll be leaving. Nothing wrong with the job, I really enjoy it and get great feedback from colleagues and clients alike. Just feel so "sneaky" about having been actively job hunting behind her back. Only reason I looked for something new is because of logistics/travel. New job is closer to home and will save me lots on transport costs.
Such an awkward conversation to bring up with her, feel like I'll be letting her down :( Anyone else feel this way when announcing plans to leave a job?

@Lighttunnelahead

Eh? Looking for a new job without discussing it with your current employer is handling it badly??

I don't know anyone who has went to their current employer to discuss job hunting before starting to look. I very much doubt most employers would take that well. you have misunderstood me - to clarify -I was not suggesting OP discusses getting a new job, rather the op has reasons for leaving this small team which might have been resolved via a chat with manager - you don’t know anyone who discusses issues with their employer to achieve a solution before starting to search for a new job - I find that to be very unusual.

Would depend on the issue. Too much work/pressure. Then maybe. Too long a commute then not really. Not much employer can do about that, other than wfh and maybe that's not possible in their team or op doesn't want that, in which case pretty pointless having a discussion as it would be fairly obvious to the employer what the outcome will be and could put the employees position in jeopardy until a new job has been found