For seamless window integration : xpra

Many solutions exist, rdp clients aren't exactly rare. I'm personally using xfreerdp for the extensive options: I can connect to a Windows system (at work) and have it be full screen on 2 of my 3 local monitors. It's fast, reliable and just works honestly.

But what you seem to be looking for is something more like RustDesk or vnc. You want to look at and help with an existing session. If you connect with remote desktop, the local monitor gets locked, so you can only take over, but not show or help. VNC over the open Internet is generally not a great idea for security, but wire guard exists, as does TailScale and/or NetBird which means you don't need to expose it. So that also works.

https://remmina.org/ ?

I use Remmina to take over Windows PCs but since it's RDP it will lock the device. If you want the other person to be able to follow along I recommend rustdesk.

Windows has an RDP server installed by default so any Linux RDP client will work (Remmina for example), just need to configure Windows to allow those incoming connections.

But RDP won't do screen-sharing, if you need that specifically look at installing a VNC server onto the Windows system, or look at stuff like Rustdesk.

if you need those connections to be more secure you'll want to look at adding VPN or SSH possibly.

For what it's worth Windows does sort of have a RDP screen sharing feature, I think it comes up as Quick Assist on Windows, but that works through Microsoft Account / servers and wouldn't do connections from Linux AFAIK.

My go-to recommendation would be rustdesk.

I use rustdesk to control my debian jellyfin server from my windows gaming laptop.

Chrome Remote Desktop works if she uses the Chrome browser and you only need occasional control when she present to authorize you getting access to her computer.

Assuming you have an existing VPN to her network, then any RDP client will work.

Remmina is the best remote client out there right now. Will work fine. Should be available everywhere.

you could slap some kind of vnc solution in there.. maybe hafta open a port on her router

Remmina as mentioned already. You can script it and run it in kiosk mode or a wm like open box

In your situation tail scale and remmina will be enough.

@akunohana https://en.wikipedia.org/wiki/Rdesktop

@akunohana
rustdesk is cross platform and decent in terms of simplicity and zero port forwarding.

VNC, and friends.

VNC server on her computer. VNC client on your computer. Make sure password is very strong since you're opening this to the wider internet. Open a port for VNC to pass through on your moms router (and possibly your own as well), and then connect remotely.

TigerVNC seems to be available for all platforms, including Windows and Linux. TigerVNC includes a server and client. (Client is sometimes called "viewer.")

https://tigervnc.org/

https://github.com/TigerVNC/tigervnc