Dwarf has a racial ability so her move is 25:Current multi-class system feels like it works pretty well.
Side note: your cleric is a dwarf with plate and a strength of 8? Jeebus...how do they get within 5' of the target when you can only move at 15'? If I was your DM I would have the mobs maneuvering around your slow butt all day long! And what do you do when your party has to move quickly? That just seems like a massive handicap!
Speed. Your base walking speed is 25 feet. Your speed is not reduced by wearing heavy armor.
I could not have done the build effectively with any other race. What really drove me to this is I LOVE Hypnotic Gaze thematically. It is so cool and running around with an at will "gaze attack" makes me feel like a medusa or vampire or something. It is extremely powerful too completely immobilizing a foe for as long as you want on one failed save with no opportunity to make another save, there is no duration to run out, no concentration to fail and no save after every turn. The low wizard AC/hps and not being able to take actions really made it a drag and very situational. So I decided to figure out how to build a character so it was less situational. Dwarf in heavy armor with at least 6 levels in order cleric to cast effective combat spells as a bonus was the answer and it is a heck of a solution! The fact that oder cleric works on enchantment spells only is also thematic as it is an enchantment wizard, but mechanically I would have done it even if it was another school, as long as it was a school with decent spells.
Since she has more cleric levels than Wizard I did have to adjust my tactics some from what I would normally do with a Cleric. Spirit Guardians for example is an awesome cleric spell and the default 3rd level spell. It does not play well with HG though, it took me a couple fights to figure that out, but I just went with cause fear (upcast) or slow (order cleric spell) as my default 3rd level concentration spell .... or upcast hold person if they were humanoids. I also had to really focus on enchantment spells so I have Charm Person, Suggestion and calm emotions while I normally might not take those. Also Tahsa's Mind Whip, but I take that a lot anyway.