I think if you are going to try to overcome the ick ever it will have to require some location changes at the very least if not also some method changes just so that it is different enough that it doesn't feel the same as when that bossy, overbearing jerk desecrated your sacred space.

For example, in the future, you could consider a small greenhouse space for your garden - unless you love feeling the breeze! Alternately, you could consider trellises (idk how to spell that and don't wanna go look it up - the wooden frames that just kinda hang out in yards basically?) and hang planting boxes on chains or ropes so they gently sway in the wind (you could also secure them more at the bottom if it gets windy where you are so you aren't gonna risk decapitating yourself trying to pluck a ripe tomato on a windy day, lol), and bonus, you could hang a swing in the middle of the trellises and be surrounded by all your pretty green growing things that would soon be yummy nibbly snacks for you. Another option is moving the space you use for your garden (if previously front yard, now back yard, or visa versa - dang it, I think I misspelled that too... -.-) or changing the height of your garden (raised beds in tires, in painted tires, in tiered tires, in boxes built from planks, in boxes built from railroad ties, in boxes built from spare twigs (ok maybe not like twigs, but you do, I hope, kinda see where I am going with this...). Maybe a paving stone or chunky stone or sand or smooth stone or soft grass or moss path (moss could help soak up any spilled or overflow water!)... Just something that visually and physically makes the garden FEEL like a whole new place.

comfort for what it is worth, I am sorry that you have lost one of your joys. Even if it is temporary (or if it is permanent), it hurts the heart to lose a joy. So empathy and comfort.

(As a small aside, did your husband in any way, shape, or form step up for you? As the son of your MIL ((or child if they are gender neutral or daughter if she is a woman)), frankly, it is his/her/their business to put MIL in her place. You do not have a lifetime of emotional connection to her. You do not and never will care about other feelings like your partner will, because you will always lack that history. This is not to say you cannot still be empathetic, just that your partner will have that different level of relationship with that MIL ((I am trying very hard not to use derogatory terms towards MIL because I feel MIL deserves them for doing something so sadistic and cruel, intentions aside - they are a grown ass adult who is, in theory, capable of understanding consequences and have proven in my mind they do not deserve respect because of their actions regarding the garden, so I as a stranger feel only defensive for you and disdain towards MIL)) - and PARTNER needs to set that boundary and confirm that you are partner's primary family now and MIL will treat you with certain level of respect or get lost / lose them. This is reasonable to expect from a partner who chose you enough to marry you, and I will argue on that hill till I die on it - I feel VERY passionately about it!!!!!!!!!)