^^^ x2. Air (from frothing) doesn't lubricate parts. Seals can blow out from overpressure.
Also, as a 'just in case' reminder, the trans fluid level is only accurate when checked with the engine running (and trans at op temp). If you're checking with the engine off, that is not a correct measurement.
There is one thing measuring with the engine off is good for, and that's to check if the pump is working (the fluid should measure lower, after the engine is started). Otherwise, measure with trans hot and engine running. If it's anywhere between the dots or in the crosshatch area, depending on your dipstick, it's acceptable. The space between the dots is (generally) about 1 US qt, so if it's close to the bottom / minimum mark, it's OK to put 1 qt in, in that case. Slightly over the top mark is fine (e.g.; it doesn't have to be 'perfect', exactly at the top mark).
However, if you find yourself actually needing to add fluid, there's a leak somewhere, as the trans is a considered a sealed system, unlike the engine (no combustion cycle). Best to find the leak.
If not in the pan area, the next most common area for leaks is the rear seal, and it'll generally be a slow leak; the tailpiece area or the front of the driveshaft (on/ near the u-joint, just in back of the yoke) will show a dark discoloration or even wetness.) That area will also attract / retain dirt, so the area may look greasy, as well.
If the trans is significantly overfilled, there's a vent up top at the rear, with a hose leading from it. Excess will flow out of that hose. But it's still not advisable to overfill to that point.
If the trans pan has a drain plug, it's a simple matter to drain the fluid, get a 1 qt bottle, and use it to transfer the fluid back into the trans (5 total, on a 4L60e). That way, you know how much is in it.
A fluid level check afterward gives you a baseline to work from. If you need to, take a pic with your phone (I haven't done this, but it's an option, if you think you might not recall where the level was at, previously)
If you have a few oz. left after transferring the fluid back in, it would be OK to re-add it back in. (Note: I'm talking up to half a quart, maximum. More than that, and I'd put it in bottle(s) and use for potential top-offs.)